Factors and Products


 Kerrie McCormick
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1 CHAPTER 3 Factors and Products What You ll Learn use different strategies to find factors and multiples of whole numbers identify prime factors and write the prime factorization of a number find square roots of perfect squares and cube roots of perfect cubes use different strategies to multiply and factor polynomials Why It s Important Factors and products are used by: cryptologists, to design codes to protect electronic data from being accessed illegally. actuaries, to design plans to help insurance companies make a profit Key Words prime number prime factorization greatest common factor common multiple least common multiple perfect square, square root perfect cube, cube root factoring perfect square trinomial difference of squares Copyright 2011 Pearson Canada Inc. 133
2 3.1 Skill Builder Divisibility Rules We can use rules to find out if a number is a factor of another number. To find out if 2, 4, 5, 8, or 10 is a factor, look at the last digits in the number: 2 is a factor of 354 because the last digit, 4, is even. 4 is a factor of 524 because 4 is a factor of the last two digits, is a factor of 585 because the last digit is 5. A number that ends in 5 8 is a factor of 3400 because 8 is a factor of or 0 is divisible by 5. the last three digits, is a factor of 210 because the last digit is 0. To find out if 3 or 9 is a factor, add the digits in the number: 3 is a factor of 411 because 3 is a factor of the sum of the digits: is a factor of 747 because 9 is a factor of the sum of the digits: To find out if 6 is a factor, use the rules for 2 and 3: 6 is a factor of 216 because the last digit, 6, is even, and 3 is a factor of the sum of the digits: Check 1. Write yes or no to answer each question. a) Is 2 a factor of 457? b) Is 3 a factor of 732? Is the last digit even? The sum of the digits is. So, is 2 a factor of 457? So, is 3 a factor of 732? c) Is 5 a factor of 734? d) Is 4 a factor of 712? Is the last digit 5 or 0? So, is 5 a factor of 734? The last 2 digits are. Is 4 a factor of 12? Is 4 a factor of 712? e) Is 6 a factor of 558? f) Is 8 a factor of 1064? Is the last digit even? The last 3 digits are. The sum of the digits is. Is 8 a factor of 64? Is 3 a factor of 558? So, is 8 a factor of 1064? So, is 6 a factor of 558? Copyright 2011 Pearson Canada Inc.
3 3.1 Factors and Multiples of Whole Numbers FOCUS Find prime factors, greatest common factors, and least common multiples of whole numbers. We can factor 24 in different ways: Write 24 as: 2 12 A prime number has only two factors: itself and Write 12 as: Write 6 as: All these numbers, except 1, are prime numbers. The prime factorization of 24 is: We can use powers: So, The prime factorization of a number is the product of its prime factors. Example 1 Writing the Prime Factorization of a Whole Number Write the prime factorization of 324. Solution Draw a factor tree. 324 The last digit is even, so 2 is a factor The last digit is even, so 2 is a factor Use divisibility rules to find factors. Keep dividing until all the factors are prime The sum of the digits is 9, so 3 is a factor Continue to divide by Write the product of the prime factors. The prime factorization of 324 is: , or If you started dividing by a different prime factor, the factor tree would be different, but the prime factorization would be the same. Write the prime factors in order from least to greatest Copyright 2011 Pearson Canada Inc. 135
4 Check 1. Complete the factor tree for 120. Continue dividing until all factors are prime The prime factorization of 120 is:, or 2. Draw a factor tree for The prime factorization of 280 is:, or The greatest common factor (GCF) of two numbers is the greatest factor the numbers have in common. For example, and and and and The factors of 12 are: 1, 2, 3, 4, 6, 12 The factors of 18 are: 1, 2, 3, 6, 9, 18 6 is the GCF of 12 and 18 because 6 is the greatest factor common to both 12 and Copyright 2011 Pearson Canada Inc.
5 Example 2 Finding the Greatest Common Factor Find the GCF of 24 and 60. Solution List the factors of 24 and the factors of Stop dividing when the next division will give you a factor you already have As you divide, you identify two factors. Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24 Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 Identify the greatest factor that is in both lists. The GCF of 24 and 60 is 12. Check 1. a) Find the GCF of 40 and 56. List the factors of 40 and the factors of Factors of 40: Factors of 56: The GCF of 40 and 56 is. Find the greatest factor that is in both lists. b) Find the GCF of 45 and 99. List the factors of 45 and the factors of Factors of 45: Factors of 99: The GCF of 45 and 99 is Copyright 2011 Pearson Canada Inc. 137
6 The first five multiples of 6 are: The first five multiples of 4 are: The first ten multiples of 6 are: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60 The first ten multiples of 4 are: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40 To get a multiple of a whole number, multiply it by a counting number. 12, 24, and 36 are common multiples of 6 and 4, because they are in both lists of multiples. 12 is the least common multiple (LCM) of 6 and 4, because 12 is the least number that is in both lists of multiples. Example 3 Finding the Least Common Multiple Find the LCM of 12 and 15. Solution List multiples of , 24, 36, 48, 60, 72, List multiples of 15 until you see a multiple of , 30, 45, 60, The LCM of 12 and 15 is 60. Check 1. Find the LCM of 20 and 25. Multiples of 20: 20, 40, Multiples of 25: 25, 50, The LCM of 20 and 25 is. Stop when you see the same number in both lists. 2. Find the LCM of 10 and 45. Multiples of 10: 10, Multiples of 45: 45, The LCM of 10 and 45 is Copyright 2011 Pearson Canada Inc.
7 Example 4 Using Greatest Common Factor to Solve a Problem Two ribbons are 24 cm and 42 cm long. Each ribbon is to be cut into equal pieces and all pieces must have the same length that is a whole number of centimetres. What is the greatest possible length of each piece? Solution Each ribbon is to be cut into equal lengths, so the lengths must be factors of 24 and factors of 42. Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24 Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42 The possible lengths, in centimetres, are the common factors of 24 and 42: 1, 2, 3, and 6 The greatest length is the GCF: 6 The greatest possible length of each piece is 6 cm. Check 1. Two ropes are 48 m and 32 m long. Each rope is to be cut into equal pieces and all pieces must have the same length that is a whole number of metres. What is the greatest possible length of each piece? The lengths of the ropes must be factors of 48 and factors of 32. Factors of 48: Factors of 32: The possible lengths, in metres, are the common factors of 48 and 32: The greatest length is the GCF: The greatest possible length of each piece is Copyright 2011 Pearson Canada Inc. 139
8 Practice 1. Complete each factor tree. a) 144 b) Use each factor tree in question 1 to write the prime factorization of: a) 144, or b) 600, or 3. For each number, draw a factor tree, then write the prime factorization a) b) The prime factorization of 252 is:, or The prime factorization of 900 is:, or Copyright 2011 Pearson Canada Inc.
9 4. Find the GCF of each pair of numbers. a) 44 and 70 List the factors of 44 and the factors of Factors of 44: Factors of 70: The GCF of 44 and 70 is. b) 36 and 48 Factors of 36: Factors of 48: The GCF of 36 and 48 is. 5. a) List the first 10 multiples of each number. Multiples of 7: 7, Multiples of 10: 10, b) The LCM of 7 and 10 is. 6. Find the LCM of each pair of numbers. a) 12 and 30 Multiples of 12: 12, 24, Multiples of 30: 30, The LCM of 12 and 30 is. b) 16 and 18 Multiples of 16: Multiples of 18: The LCM of 16 and 18 is. 7. Hamburger patties come in packages of 8. Buns come in packages of 6. What is the least number of hamburgers that can be made with no patties or buns left over? The total number of patties are multiples of 8:,,,,, The total number of buns are multiples of 6:,,,,, For there to be no patties or buns left over, the numbers of patties and buns must be the same. Find the of 6 and 8: The least number of hamburgers is Copyright 2011 Pearson Canada Inc. 141
10 3.2 Perfect Squares, Perfect Cubes, and Their Roots FOCUS Find square roots of perfect squares and cube roots of perfect cubes. A perfect square is the square of a whole number. For example, 16 is a perfect square because We say: 4 is the square root of 16. We write: is a perfect square. The prime factorization of 100 is: , or square units 4 units The prime factors occur in pairs. This is true for any perfect square. So, we can use prime factorization to find the square root of a perfect square. Example 1 Finding the Square Root of a Perfect Square Find 324. Solution Draw a factor tree Use multiplication facts to make the factor tree smaller: The prime factorization of 324 is: Group the factors as 2 equal products. (2 3 3) (2 3 3) Multiply the factors Since , or 18 2 Then, Copyright 2011 Pearson Canada Inc.
11 Check 1. Find 576. Complete this factor tree The prime factorization of 576 is: 576 Group the factors as 2 equal products. (2 ) (2 ) Multiply the factors. So, 576 A perfect cube is the cube of a whole number. For example, 125 is a perfect cube because We say: 5 is the cube root of 125. We write: Volume = 125 cubic units 5 units 5 units 5 units Example 2 Finding the Cube Root of a Perfect Cube Find Solution Draw a factor tree Copyright 2011 Pearson Canada Inc. 143
12 Write the prime factorization of Group the factors as 3 equal products. (2 7) (2 7) (2 7) Multiply the factors Since , or 14 3 Then, Check 1. Find Complete this factor tree The prime factorization of 216 is: 216 Group the factors as equal products. (2 ) (2 ) (2 ) the factors. So, Use multiplication facts to make the factor tree smaller. Example 3 Using Roots to Solve a Problem A rectangular prism has dimensions 16 cm by 8 cm by 4 cm. What is the edge length of a cube with the same volume? Solution First find the volume of the prism. Volume of the rectangular prism is: V lwh Substitute: l 16, w 8, and h 4 V V cm 4 cm 8 cm Copyright 2011 Pearson Canada Inc.
13 Now consider a cube with the same volume as the prism. A cube has equal edge lengths. Let the edge length be e centimetres. e V = 512 cm 3 Volume of the cube is: V e 3 Substitute: V 512 e e 512 e 3 e Use a calculator to find the prime factors of Group the factors as 3 equal products. (2 2 2) (2 2 2) (2 2 2) So, The edge length of the cube is 8 cm. Check 1. A rectangular prism has dimensions 8 in. by 4 in. by 2 in. What is the edge length of a cube with the same volume? 8 in. 2 in. 4 in. First find the volume of the prism. Volume of the rectangular prism is: V Substitute: V V Now think of a cube with the same volume. Let the edge length of the cube be e centimetres. Volume of the cube is: V e 3 Substitute: V e e 3 e 3 e e Use a calculator or a factor tree to find the prime factors of. 2 Group the factors as equal ( ) ( ) ( ) products. So, 3 The edge length of the cube is Copyright 2011 Pearson Canada Inc. 145
14 Practice 1. Use prime factorization to find each square root. a) ( ) ( ) So, b) ( ) ( ) So, c) ( ) ( ) So, Use prime factorization to find each cube root. 729 a) ( ) ( ) ( ) So, b) ( ) ( ) ( ) So, Copyright 2011 Pearson Canada Inc.
15 c) ( ) ( ) ( ) So, Find the edge length of this cube. V = 5832 cm 3 3 So, The edge length of the cube is Copyright 2011 Pearson Canada Inc. 147
16 CHECKPOINT 1 Can you write the prime factorization of a number? find the greatest common factor and least common multiple of two numbers? find the square root of a perfect square? find the cube root of a perfect cube? Complete each factor tree. Then write each prime factorization. a) b) , 450, or or 2. Find the GCF of 42 and 50. List the factors of 42 and the factors of Look for the same factor in both lines. Factors of 42: Factors of 50: The GCF of 42 and 50 is. 3. Find the LCM of each pair of numbers. a) 9 and 21 Multiples of 9 are: 9, Multiples of 21: 21, Stop when you see a multiple of 9. The LCM of 9 and 21 is. b) 14 and 22 Multiples of 14: 14, Multiples of 22: The LCM of 14 and 22 is Copyright 2011 Pearson Canada Inc.
17 Find each square root. a) Draw a factor tree. 484 ( ) ( ) So, 484 b) Draw a factor tree ( ) ( ) So, Find each cube root. a) So, b) ( ) ( ) ( ) So, Copyright 2011 Pearson Canada Inc. 149
18 3.3 Skill Builder Multiplying and Dividing a Binomial by a Constant A polynomial is 1 term or the sum of terms. Here are 3 types of polynomials: A monomial has 1 term; for example, 5a, 6, 2x 2 A binomial has 2 terms; for example, 2c 5, 3y 2 2y A trinomial has 3 terms; for example, 4b 2 5b 2 We can use algebra tiles to model polynomials. This is a 1tile. This is an xtile. This is an x 2 tile. A grey tile represents a positive term. To multiply 2(3x 1): Using algebra tiles Using the distributive property 2(3x 1) Multiply each term in the binomial by the constant. Show 2 rows of 3 and 1. 2(3x 1) 2(3x) 2(1) 6x 2 There are 6 and 2. So, 2(3x 1) 6x 2 4x To divide 8x : 2 Using algebra tiles 4x 2 8x 2 Using division Divide each term of the binomial by 2. 4x 2 8x 4x x 2 Arrange 4 and 8 in 2 2x 2 4x equal rows. The xtile can be used to represent any variable, such as a ytile or a ctile. The x 2 tile may represent a y 2 tile or a c 2 tile. In each row, there are 2 and 4. So, 4x 2 8x 2 2x 2 4x Copyright 2011 Pearson Canada Inc.
19 Check 1. Multiply: 3(4b 2) Using algebra tiles Using the distributive property Sketch rows of and. Multiply each term of the binomial by the constant. 3(4b 2) 3( ) 3( ) There are and. So, 3(4b 2) 2. Divide: 9r 2 6r 3 Using algebra tiles Sketch and in equal rows. Using division Divide each term of the binomial by. 9r 2 6r 9r 2 6r r 2 r In each row, there are and. So, 9r 2 6r Copyright 2011 Pearson Canada Inc. 151
20 Multiplying and Dividing a Binomial by a Monomial To multiply 2x(3x 1): Using algebra tiles Using the distributive property Outline a rectangle with length 3 Multiply each term of the binomial and 1, and width 2. by 2x. Fill in the rectangle with and. 2x(3x 1) 2x(3x) 2x(1) 6x 2 2x There are 6 and 2. So, 2x(3x 1) 6x 2 2x 4x To divide 8x : 2x Using algebra tiles Arrange 4 and 8 in a rectangle with width 2. 2x + 4 Using division Divide each term of the binomial by 2x. 4x 2 8x 4x2 2x 2x 8x 2x 2x 4 2x Remember that x 2 x x x and 1. x The length of the rectangle is 2 and 4. 4x So, 2 8x 2x 4 2x Copyright 2011 Pearson Canada Inc.
21 Check 1. Multiply: 3b(4b 2) Using algebra tiles Using the distributive property Outline a rectangle with length Multiply each term of the and, and width. binomial by 3b. Fill in the rectangle with and. 3b(4b 2) 3b( ) 3b( ) Sketch the tiles. There are and. So, 3b(4b 2) 6a 2. Divide: 2 8a 2a Using algebra tiles Arrange and in a rectangle with width. Sketch the tiles. Label the rectangle. Using division Divide each term of the binomial by. 6a 2 8a 6a 2 8a The length of the rectangle is and. So, 6a 2 8a 2a Copyright 2011 Pearson Canada Inc. 153
22 3.3 Common Factors of a Polynomial FOCUS Factor polynomials. To factor a polynomial, we write it as a product of polynomials. This rectangle models the polynomial 6x 2 2x. 6x + 2 x The length and width of the rectangle are factors of the polynomial. The length is 6x 2 and the width is x. So, 6x 2 and x are factors of 6x 2 2x. We write: 6x 2 2x x(6x 2) This binomial can be factored further because both terms have a common factor, 2. This rectangle also models the polynomial 6x 2 2x. 3x + 1 2x 2x and 3x 1 are factors of 6x 2 2x. 2x is the greatest common factor of 6x 2 2x. The length is 3x 1 and the width is 2x. We write: 6x 2 2x 2x(3x 1) To factor a polynomial means to factor fully. This binomial cannot be factored further, so the polynomial is factored fully Copyright 2011 Pearson Canada Inc.
23 Example 1 Using Algebra Tiles to Factor a Binomial Factor each binomial. a) 4x 6 b) 3b 2 6b Solution a) Use algebra tiles to model 4x 6 as a rectangle. 2x The length of the rectangle is 2x 3. The width of the rectangle is 2. So, 4x 6 2(2x 3) Since 2 is the greatest common factor (GCF) of 4 and 6, make 2 equal rows of tiles. The factoring is complete because 2x 3 cannot be factored further. We can check the factors by multiplying. 2(2x 3) 2(2x) 2(3) 4x 6 b) Use algebra tiles to model 3b 2 6b as a rectangle. b + 2 3b Since 3 is the GCF of 3 and 6, make 3 equal rows of tiles. The length of the rectangle is b 2. The width of the rectangle is 3b. So, 3b 2 6b 3b(b 2) Copyright 2011 Pearson Canada Inc. 155
24 Check 1. Factor each binomial. a) 5c 10 Use algebra tiles to model 5c 10 as a rectangle. Since is the GCF of 5 and 10, make equal rows of tiles. Sketch the tiles. The length of the rectangle is. The width of the rectangle is. So, 5c 10 b) 4n 2 14n Use algebra tiles to model 4n 2 14n as a rectangle. Since is the GCF of 4 and 14, make equal rows of tiles. Sketch the tiles. The length of the rectangle is. The width of the rectangle is. So, 4n 2 14n If the numbers in the polynomial are large or if the numbers are negative, we factor by dividing. Example 2 Factoring Binomials by Dividing Factor each binomial. a) 10a 8 b) 6m 2 4m Solution a) 10a 8 Find the GCF of the terms of the binomial. Factor each term of the binomial. 10a 2 5 a The GCF is 2. This is one factor of the binomial. Divide each term of the binomial by 2 to get another factor. 10a 8 10a a 4 This is the other factor of the binomial. So, 10a 8 2(5a 4) Copyright 2011 Pearson Canada Inc.
25 b) 6m 2 4m Find the GCF of the terms of the binomial. Factor each term of the binomial. When we list the factors of a negative term, we don t need to 6m m m 4m 2 2 m Multiply the factors that are in both lists. write the negative sign. The GCF is 2 m 2m. This is one factor of the binomial. Divide each term of the binomial by 2m to get the other factor. 6m 2 4m 6m2 2m 2m 4m 2m 3m 2 This is the other factor of the binomial. So, 6m 2 4m 2m( 3m 2) Check 1. Factor each binomial. a) 4n 32 Factor each term of the binomial. 4n 32 The GCF is. Divide each term of the binomial by. 4n 32 4n 32 So, 4n 32 Circle the factors that are in both lists. b) 18r 2 12r Factor each term of the binomial. 18r 2 12r The GCF is. Divide each term of the binomial by. 18r 2 12r 18r2 12r So, 18r 2 12r Copyright 2011 Pearson Canada Inc. 157
26 When we use algebra tiles to factor a trinomial with positive terms, we may not be able to make a rectangle so we make equal groups of tiles instead. Example 3 Factoring Trinomials with a Common Factor Factor each trinomial. a) 2n 2 4n 6 b) 3n 2 12n 9 Solution a) 2n 2 4n 6 Since all the terms are positive, use algebra tiles. Use 2, 4, and 6. Since 2 is the GCF of 2, 4, and 6, arrange the tiles in 2 equal groups. There are 2 equal groups, so 2 is one factor. Each group models n 2 2n 3, so this polynomial is the other factor. Write the factors as a product. So, 2n 2 4n 6 2(n 2 2n 3) b) 3n 2 12n 9 Since some terms are negative, divide by the GCF to find the factors. Factor each term of the trinomial. 3n 2 3 n n 12n n The GCF is 3. Divide each term of the trinomial by 3. 3n 2 12n 9 3 3n2 3 12n n 2 4n 3 So, 3n 2 12n 9 3(n 2 4n 3) Copyright 2011 Pearson Canada Inc.
27 Check 1. Factor each trinomial. a) 6n 2 3n 9 Since all the terms are positive, use algebra tiles. Use,, and. Since is the GCF of 6, 3, and 9, arrange the tiles in equal groups. Sketch the tiles. There are equal groups, so is one factor. Each group models n 2 n, so this polynomial is the other factor. So, 6n 2 3n 9 b) 12v 2 8v 16 Since some terms are negative, divide by the GCF to find the factors. 12v 2 8v Circle the factors that are in both 16 lists, then multiply. The GCF is. Divide each term of the trinomial by. 12v 2 8v 16 12v 2 8v 16 v 2 v So, 12v 2 8v 16 ( v 2 v ) As we remove 1 as a common factor, multiply each term in the brackets by 1. ( v 2 v ) ( v 2 v ) So, 12v 2 8v 16 When the 1st term in the trinomial is negative, we remove 1 as a common factor Copyright 2011 Pearson Canada Inc. 159
28 Practice 1. a) Write the binomial modelled by these algebra tiles: b) The length of the rectangle is. The width of the rectangle is. Factor the binomial: 2. Use algebra tiles to factor each binomial. a) 8w 12 Since is the GCF of 8 and 12, make equal rows of tiles. Sketch the tiles. The length of the rectangle is. The width of the rectangle is. So, 8w 12 b) 6x 2 15x Since is the GCF of 6 and 15, make equal rows of tiles. Sketch the tiles. The length of the rectangle is. The width of the rectangle is. So, 6x 2 15x 3. Factor each binomial by dividing. a) 9z 36 Factor each term of the binomial. 9z 36 The GCF is. Divide each term of the binomial by. 9z 36 9z 36 So, 9z 36 b) 25t 2 10t Factor each term of the binomial. 25t 2 10t The GCF is. Divide each term of the binomial by. 25t 2 10t So, 25t 2 10t Copyright 2011 Pearson Canada Inc.
29 4. Factor each trinomial. a) 4x 2 8x 2 Since all the terms are positive, use algebra tiles. Use,, and. Since is the GCF of 4, 8, and 2, arrange the tiles in equal groups. Sketch the tiles. There are equal groups, so is one factor. Each group models, so this polynomial is the other factor. So, 4x 2 8x 2 b) 15a 2 10a 30 Factor each term of the trinomial. The GCF is. Divide each term of the trinomial by. Remove 1 as a common factor. So, 15a 2 10a 30 c) 24n 2 16n 8 So, 24n 2 16n Copyright 2011 Pearson Canada Inc. 161
30 3.4 Math Lab: Modelling Trinomials as Binomial Products FOCUS Explore trinomials with algebra tiles. We can use the distributive property and an area model to show the product of two 2digit numbers (10 3)(10 5) 10(10 5) 3(10 5) 10(10) 10(5) 3(10) 3(5) We can use the same process to show the product of two binomials. Try This Use only positive algebra tiles. Part A This rectangle represents the trinomial x 2 2x 1. Write each side length on the rectangle. Use the side lengths to write the polynomial as a product: x 2 2x 1 (x )(x ) x + x + Sketch as many and as you need to complete this rectangle to show the trinomial x 2 3x 2. Write as a product: x 2 3x 2 (x )(x ) Copyright 2011 Pearson Canada Inc.
31 Sketch as many and as you need to complete this rectangle to show the trinomial x 2 4x 4. Write as a product: x 2 4x 4 ( )( ) Sketch as many and as you need to complete this rectangle to show a different trinomial. Write as a product: Use 1 and as many and as you need to make, then sketch a rectangle to show a different trinomial. Write as a product: Part B This rectangle represents the trinomial 2x 2 3x 1. Write each side length on the rectangle. Write as a product: 2x 2 3x 1 (2x )(x ) x + 2x + Sketch as many and as you need to complete this rectangle to show the trinomial 2x 2 7x 3. Write as a product: 2x 2 7x 3 (2x )(x ) Sketch as many and as you need to complete this rectangle to show the trinomial 2x 2 4x 2. Write as a product: 2x 2 4x 2 ( )( ) Sketch as many and as you need to complete this rectangle to show a different trinomial. Write as a product: Copyright 2011 Pearson Canada Inc. 163
32 Use 2 and as many and as you need to make, then sketch a rectangle to show a different trinomial. Write as a product: Part C From Part A, copy 3 trinomials and their products below. How are the numbers in each trinomial related to the numbers in its product? Here is a trinomial and its product from Part B: 2x 2 7x 3 (2x 1)(x 3) How is this term in the trinomial related to these terms in the product? 2x 2 7x 3 (2x 1)(x 3) How is this term in the trinomial related to the indicated terms in the product? 2x 2 7x 3 (2x 1)(x 3) How is this term in the trinomial related to these terms in the product? Copyright 2011 Pearson Canada Inc.
33 Practice 1. For each set of algebra tiles below: Write the trinomial. Write the trinomial as a product. a) b) The trinomial is: x 2 x The product is: (x )(x ) c) The trinomial is: x 2 x The product is: ( x )(x ) The trinomial is: The product is: 2. a) Use 1, 6, and 8 to make a rectangle. Sketch the rectangle. b) Write the trinomial: c) Write the trinomial as a product: Copyright 2011 Pearson Canada Inc. 165
34 3.5 Skill Builder Adding and Subtracting Binomials To add or subtract binomials, group like terms, then combine the terms by adding their coefficients. To add: (4x 2) ( 3x 6) Remove brackets. 4x 2 3x 6 Group like terms. 4x 3x 2 6 Combine like terms. x 4 To subtract: (2x 3) (4x 1) Remove brackets. Change the signs of the subtracted terms. 2x 3 4x 1 Group like terms. 2x 4x 3 1 Combine like terms. 2x 2 Check 1. Add. a) (4x 2) (5x 1) b) (5n 3) ( n 6) 4x 2 5x 1 5n 3 4x 2 5n 3 x c) ( 6x 3) (3x 4) d) ( 4s 5) (3s 1) x x 2. Subtract. a) (2m 5) (m 3) b) (5 3h) (2 4h) 2m 5 m 3 c) (t 2) ( 2t 4) d) (2r 1) ( 3r 2) Copyright 2011 Pearson Canada Inc.
35 3.5 Polynomials of the Form x 2 bx c FOCUS Use different strategies to multiply binomials and to factor trinomials. These algebra tiles and the rectangle diagram model the trinomial x 2 7x 10. x + 5 x 5 x + 2 x (x)(x) = x 2 (x)(5) = 5x 2 (2)(x) = 2x (2)(5) = 10 (x 5)(x 2) x 2 7x 10 (x 5)(x 2) x 2 5x 2x 10 x 2 7x 10 We can use these models to multiply, or expand, two binomials. Example 1 Using Models and Diagrams to Multiply Two Binomials Expand, then simplify. a) (x 6)(x 3) b) (n 5)(n 2) Solution a) (x 6)(x 3) Since all the terms are positive, use algebra tiles. Use 1 and 6 as the length of a rectangle. Use 1 and 3 as the width of the rectangle. Use algebra tiles to make the rectangle. x x 6 The tiles used are: 1, 9, and 18 So, (x 6)(x 3) x 2 9x 18 3 b) (n 5)(n 2) Since some terms are negative, use a rectangle diagram. Sketch a rectangle with length n 5 and width n 2. Divide the rectangle into smaller rectangles. Multiply the terms that label the sides of each small rectangle. n n 5 n n = n2 n ( 5) = 5n Add the products from the smaller rectangles. (n 5)(n 2) n 2 5n 2n 10 n 2 7n 10 2 ( 2) n = 2n ( 2) ( 5) = Copyright 2011 Pearson Canada Inc. 167
36 Check 1. Expand, then simplify. a) (x 7)(x 2) Use algebra tiles. Use and as the length of a rectangle. Use and as the width of a rectangle. To make the rectangle, use these tiles: Sketch the tiles.,, and So, (x 7)(x 2) x 2 x b) (n 3)(n 4) Use a rectangle diagram. Sketch a rectangle with length and width. Divide the rectangle into smaller rectangles. n 3 n n n = n = 4 n = 3 = Add the products from the smaller rectangles. (n 3)(n 4) We can use the distributive property to multiply two binomials. (z 5)(z 3) z(z 3) 5(z 3) z(z) z(3) 5(z) 5(3) z 2 3z 5z 15 z 2 8z Copyright 2011 Pearson Canada Inc.
37 Example 2 Multiplying Two Binomials Expand, then simplify. a) (x 6)(x 3) b) (n 6)(n 4) Solution Use the distributive property. a) (x 6)(x 3) x(x 3) 6(x 3) x(x) x( 3) 6(x) 6( 3) x 2 3x 6x 18 x 2 3x 18 b) (n 6)(n 4) n(n 4) 6(n 4) n(n) n( 4) 6(n) 6( 4) n 2 4n 6n 24 n 2 10n 24 Multiply. Combine like terms. Check 1. Expand, then simplify. a) (x 5)(x 3) x( ) 5( ) x( ) x( ) 5( ) 5( ) b) (v 7)(v 3) v( ) 7( ) v( ) v( ) 7( ) 7( ) Use the distributive property. Multiply. Combine like terms. In Examples 1 and 2, we multiplied two binomials, then simplified the product to get a trinomial. When we reverse the process and write a trinomial as a product of two binomials, we factor the trinomial Copyright 2011 Pearson Canada Inc. 169
38 Example 3 Using Algebra Tiles to Factor a Trinomial Use algebra tiles to factor x 2 6x 5. Solution To model x 2 6x 5, use 1, 6, and 5. To form a rectangle: Place at the top left. Arrange 6 beneath and to the right of. Use 5 to complete the rectangle. The length and width of the rectangle are the factors. So, x 2 6x 5 (x 5)(x 1) x + 1 x + 5 Check 1. Use algebra tiles to factor x 2 7x 12. Use,, and. Arrange beneath Sketch the tiles. Label the length and width. You may have to move the and to and to the right of make a rectangle. so there is space to fit. So, x 2 7x 12 (x )(x ) We can use the patterns in the numbers in a trinomial and its factors to help factor a trinomial. When we factor a trinomial, we find two numbers whose sum is the coefficient of the xterm in the trinomial and whose product is the constant term x 2 7x 12 (x 3)(x 4) Remember the patterns you discovered in Lesson Copyright 2011 Pearson Canada Inc.
39 Example 4 Using Algebra to Factor Trinomials Factor each trinomial. a) x 2 5x 6 b) x 2 x 12 Solution a) x 2 5x 6 The coefficient of x is 5. The constant term is 6. Write pairs of factors of 6: 1 6 and 2 3 The coefficient of x is positive, so we don t need to list negative factors. There are 2 pairs of factors, so there are 2 possible binomials: (x 1)(x 6) (x 2)(x 3) Multiply to find which trinomial has the term 5x. (x 1)(x 6) (x 2)(x 3) x 2 6x 1x 6 x 2 3x 2x 6 x 2 7x 6 x 2 5x 6 This is the correct trinomial. So, x 2 5x 6 (x 2)(x 3) b) x 2 x 12 Think of x 2 x 12 as x 2 1x 12. The coefficient of x is 1, so the sum of the factors is 1. The constant term is 12, so the product of the factors is 12. Factors of 12 1 ( 12) ( 1) 12 2 ( 6) ( 2) 6 3 ( 4) ( 3) 4 Sum of the factors Use a table to list pairs of factors of 12, and their sum. It helps to list the factors in order, starting with 1. You may be able to use mental math to identify factors, then find their sum. So, the factors of 12 are 3 and 4. Then, x 2 x 12 (x 3)(x 4) You can expand to check the binomial factors are correct. Not all trinomials can be factored as a product of two binomials. For example, x 2 5x 12 cannot be factored because we cannot form a rectangle with the algebra tiles, and no pair of factors of 12 has a sum of Copyright 2011 Pearson Canada Inc. 171
40 Check 1. Factor each trinomial. a) x 2 6x 8 The coefficient of x is, so the sum of the factors is. The constant term is, so the product of the factors is. Factors of 1 ( 1) 2 ( 2) Sum of the factors is positive, so both its factors have the same sign. The xterm is negative, so both factors must be negative. So, the factors of are and. Then, x 2 6x 8 (x )(x ) b) c 2 2c 15 The coefficient of c is, so the sum of the factors is. The constant term is, so the product of the factors is. Factors of 1 ( ) ( 1) 3 ( ) ( 3) Sum of the factors The factors of are and. So, c 2 2c 15 (c )(c ) Practice 1. Expand, then simplify. a) (x 3)(x 5) Use algebra tiles to make a rectangle. Use and as the length. Use and as the width. To make the rectangle, use these tiles: Sketch the tiles. Label the length and width.,, and So, (x 3)(x 5) x 2 x Copyright 2011 Pearson Canada Inc.
41 b) (n 5)(n 7) Use a rectangle diagram. Sketch a rectangle with length and width. Divide the rectangle into smaller rectangles. = = = = Add the products from the smaller rectangles. (n 5)(n 7) 2. Use the distributive property to multiply, then simplify. a) (x 10)(x 4) x( ) 10( ) x( ) x( ) 10( ) 10( ) b) (n 9)(n 6) n( ) 9( ) n( ) n( ) 9( ) 9( ) c) (h 7)(h 4) 3. Factor each trinomial. a) x 2 10x 9 Use algebra tiles. Sketch the tiles. Label the length and width. Use,, and. Arrange so there is space to fit. So, x 2 10x 9 (x )(x ) Copyright 2011 Pearson Canada Inc. 173
42 b) x 2 13x 12 The coefficient of x is, so the sum of the factors is. The constant term is, so the product of the factors is. Factors of 1 ( 1) ( ) 2 ( 2) ( ) 3 ( 3) ( ) Sum of the factors The factors of are and. So, x 2 13x 12 (x )(x ) c) n 2 8n 20 The sum of the factors is. The product of the factors is. is positive, so both its factors have the same sign. The xterm is, so both factors must be. Once you have found the sum you need, you don t have to add any more factors. Factors of Sum of the factors So, n 2 8n 20 d) c 2 7c 18 So, c 2 7c Copyright 2011 Pearson Canada Inc.
43 3.6 Polynomials of the Form ax 2 bx c FOCUS Multiply binomials and factor trinomials. In Lesson 3.5, all the trinomials had x 2 terms with coefficient 1. In this lesson, we will work with trinomials whose x 2 terms have coefficients that are not 1. These algebra tiles model the trinomial 2x 2 11x 12. The lengths of the sides of the rectangle can be used to write the trinomial as a product. 2x 2 11x 12 (2x 3)(x 4) We can use this model to help us multiply two binomials. x + 4 2x + 3 Example 1 Using Models and Diagrams to Multiply Two Binomials Expand, then simplify. a) (2x 4)(3x 1) b) (3n 5)(4n 7) Solution a) (2x 4)(3x 1) Since all the terms are positive, use algebra tiles to make a rectangle. Use 2 and 4 as the length. Use 3 and 1 as the width. These tiles were used to make the rectangle: 6, 14, and 4 So, (2x 4)(3x 1) 6x 2 14x 4 3x 1 2x 4 b) (3n 5)(4n 7) Since some terms are negative, use a rectangle diagram. Sketch a rectangle with length 3n 5 and width 4n 7. 4n 3n 5 4n 3n = 12n 2 4n ( 5) = 20n Divide the rectangle into smaller rectangles. Add the products from the smaller rectangles. (3n 5)(4n 7) 12n 2 20n 21n 35 12n 2 41n 35 7 ( 7) 3n = 21n ( 7) ( 5) = Copyright 2011 Pearson Canada Inc. 175
44 Check 1. Expand, then simplify. a) (4x 2)(2x 3) Use algebra tiles to make a rectangle. Use and for the length. Use and for the width. To make the rectangle, use these tiles:,, and So, (4x 2)(2x 3) x 2 x b) (5n 2)(3n 7) Use a rectangle diagram. Sketch a rectangle with length and width. Divide the rectangle into smaller rectangles. Add the products from the smaller rectangles. (5n 2)(3n 7) 5n 3n 3n 5n = 7 5n = 2 3n = = We can use the distributive property to multiply two binomials. Example 2 Multiplying Two Binomials Expand, then simplify. a) (4n 3)(2n 2) b) ( 3f 4)(2f 5) Solution Use the distributive property. a) (4n 3)(2n 2) 4n(2n 2) 3(2n 2) 4n(2n) 4n(2) 3(2n) 3(2) Multiply. 8n 2 8n 6n 6 Combine like terms. 8n 2 14n 6 b) ( 3f 4)(2f 5) 3f(2f 5) 4(2f 5) ( 3f)(2f) ( 3f)( 5) 4(2f) 4( 5) 6f 2 15f 8f 20 6f 2 23f Copyright 2011 Pearson Canada Inc.
45 Check 1. Expand, then simplify. a) (3f 4)(2f 6) Use the distributive property. (3f 4)(2f 6) 3f( ) 4( ) 3f( ) 3f( ) 4( ) 4( ) Multiply. Combine like terms. b) (4m 9)( 5m 2) Use the distributive property. (4m 9)( 5m 2) 4m( ) 9( ) 4m( ) 4m( ) 9( ) 9( ) m 2 m m In Examples 1 and 2, we multiplied two binomials. We now reverse the process and factor a trinomial. Example 3 Factoring a Trinomial with Positive Terms Factor each trinomial. a) 2x 2 7x 6 b) 3n 2 8n 4 Solution a) 2x 2 7x 6 Use algebra tiles to factor. Use 2, 7, and 6. Start with 2. Arrange 7 beneath and to the x + 2 right of the rectangle formed by 2. Use 6 to complete the rectangle. The length and width of the rectangle are the factors. So, 2x 2 7x 6 (2x 3)(x 2) 2x Copyright 2011 Pearson Canada Inc. 177
46 b) 3n 2 8n 4 3n 2 8n 4 The 1st term is 3n 2. The 3rd term is 4. Write this term as Write this term as a product of factors: a product of factors. 3n 2 3n n These factors are the 1st terms in the binomials. The factors in one of these pairs are the 2nd terms in the binomials. Write all possible binomials. (3n 4)(n 1) (3n 1)(n 4) (3n 2)(n 2) Multiply, then add to find which product has the term 8n. (3n 4)(n 1) (3n 1)(n 4) (3n 2)(n 2) 3n 2 3n 4n 4 3n 2 12n n 4 3n 2 6n 2n 4 3n 2 7n 4 3n 2 13n 4 3n 2 8n 4 So, 3n 2 8n 4 (3n 2)(n 2) Expand factors to check the binomial. This product has the term 8n. Check 1. Factor each trinomial. a) 2x 2 9x 4 Use algebra tiles to factor. Sketch the tiles. Label the length and width. Use,, and. Start with. Arrange beneath and to the right of the rectangle formed by, so there is space to fit. So, 2x 2 9x Copyright 2011 Pearson Canada Inc.
47 b) 7n 2 16n 4 7n 2 16n 4 The 1st term is 7n 2. The 3rd term is. Write this term as Write this term as a product of factors: a product of factors: 7n 2 7n Write all possible binomials. (7n )( ) (7n )( ) (7n )( ) Multiply to find which product has the term 16n. (7n )( ) (7n )( ) 7n 2 7n 2 (7n )( ) So, 7n 2 16n 4 Look at the trinomial 7n 2 16n 4 and its factored form (7n 2)(1n 2). In the trinomial: The 1st term is 7n 2, and the factors of 7 are 1 and 7. The 3rd term is 4, and the factors of 4 are 2 and 2. We write one pair of factors next to the other. When we multiply the numbers as shown then add, we get: (1 2) (7 2) This is the coefficient of n in the trinomial. We can use this strategy to find the terms for the binomial factors of any trinomial. For example, to factor 5x 2 17x 6: The 1st term is 5x 2, and the factors of 5 are 1 and 5. The 3rd term is 6, and its factors are 1 and 6; 2 and 3. Write each pair of factors of 6 next to a pair of factors of Multiply, then add: (1 6) (5 1) (1 1) (5 6) (1 3) (5 2) (1 2) (5 3) This is the coefficient of x Copyright 2011 Pearson Canada Inc. 179
48 So, the factors of 5 are 1 and 5; and the factors of 6 are 3 and 2. The coefficient of x and the constant term in one binomial The binomial factors are (1x 3)(5x 2). Then, 5x 2 17x 6 (x 3)(5x 2) The coefficient of x and the constant term in the other binomial Example 4 Factoring a Trinomial with Negative Terms Factor each trinomial. a) 7x 2 18x 9 b) 6n 2 7n 2 Solution a) 7x 2 18x 9 The 1st term is 7x 2. The factors of 7 are: 1 and 7 7x 2 18x 9 The 3rd term is 9. The factors of 9 are: 1 and 9; 1 and 9; 3 and 3 Write each pair of factors of 9 next to a pair of factors of 7. Find the products. 1 1 [1 ( 9)] (7 1) We stop when we 1 9 (1 1) [7 ( 9)] 1 63 get 18 as the sum of the products (1 9) [7 ( 1)] [1 ( 1)] (7 9) [1 ( 3)] (7 3) This is the coefficient of x. So, the factors of 7 are 1 and 7; and the factors of 9 are 3 and 3. The binomial factors are (1x 3)(7x 3). Then, 7x 2 18x 9 (x 3)(7x 3) Copyright 2011 Pearson Canada Inc.
49 b) 6n 2 7n 2 6n 2 7n 2 The 1st term is 6n 2. The 3rd term is 2. The factors of 6 are: The factors of 2 are: 1 and 6; 2 and 3 1 and 2 The 2nd term of the trinomial is negative, and the 3rd term is positive, so write only the negative factors of 2. Write the pair of factors of 2 next to each pair of factors of 6. Find the products. 1 1 [1 ( 2)] [6 ( 1)] [1 ( 1)] [6 ( 2)] [2 ( 2)] [3 ( 1)] We stop when we get 7 as the sum of the products. 7 This is the coefficient of n. So, the factors of 6 are 2 and 3; and the factors of 2 are 1 and 2. The binomial factors are (2n 1)(3n 2). Then, 6n 2 7n 2 (2n 1)(3n 2) You can check the binomial factors by expanding to see if you get the original trinomial. Check 1. Factor this trinomial: 8m 2 2m 3 The 1st term is 8m 2. The 3rd term is 3. The factors of are: The factors of are: 1 and ; 2 and 1 and ; 1 and Write each pair of factors of next to a pair of factors of. Find the products. [ ( )] ( ) ( ) [ ( )] ( ) [ ( )] Stop when you get as the sum of the [ ( )] [ ] products. So, the factors of are and ; and the factors of are and. The binomial factors are ( )( ). So, 8m 2 2m Copyright 2011 Pearson Canada Inc. 181
50 Practice 1. Expand, then simplify. a) (3x 5)(x 1) Use algebra tiles to make a rectangle. Use and for the length. Use and for the width. To make the rectangle, use these tiles: Sketch the tiles. Label the length and width.,, and So, (3x 5)(x 1) b) (4w 3)(5w 9) Use a rectangle diagram. Sketch a rectangle with length and width. Divide the rectangle into smaller rectangles. = = = = Add the products in the smaller rectangles. (4w 3)(5w 9) 2. Expand, then simplify. a) ( 2v 6)(5v 3) ( 2v)( ) 6( ) ( 2v)( ) ( 2v)( ) 6( ) 6( ) b) (7c 8)( 4c 1) Copyright 2011 Pearson Canada Inc.
51 3. Factor each trinomial. a) 2x 2 15x 7 Use algebra tiles to factor. Sketch the tiles. Use,, and. Start with. Arrange so there is space to fit. So, 2x 2 15x 7 b) 5m 2 16m 3 5m 2 16m 3 The 1st term is. Its factors are: The 3rd term is. Its factors are: Write all possible binomials. Multiply to find which product has the term 16m. ( )( ) ( )( ) So, 5m 2 16m 3 4. Factor each trinomial. a) 3x 2 5x 2 3x 2 5x 2 The 1st term is. The factors of are: and The 3rd term is. The factors of are: and ; and Write each pair of factors of next to the pair of factors of. Find the products. ( ) [ ( )] [ ( )] ( ) Stop when you get as the sum of the products Copyright 2011 Pearson Canada Inc. 183
52 [ ( )] ( ) ( ) [ ( )] So, the factors of are and ; and the factors of are and. The binomial factors are: So, 3x 2 5x 2 b) 2x 2 13x 15 2x 2 13x 15 The 1st term is. The factors of are: and The 3rd term is. The factors of are: Write each pair of factors of next to the pair of factors of. Find the products. and ; and The 2nd term of the trinomial is, and the 3rd term is, so write only the factors of. Stop when you get as the sum of the products. So, the factors of are and ; and the factors of are and. The binomial factors are: So, 2x 2 13x Copyright 2011 Pearson Canada Inc.
53 CHECKPOINT 2 Can you find the common factor of a binomial or a trinomial? multiply two binomials? factor trinomials? Factor each polynomial by dividing. a) 15q 25 Factor each term of the binomial. 15q 25 The GCF is. Divide each term of the binomial by. 15q 25 So, 15q 25 b) 18s 2 24s 6 Factor each term of the trinomial. 18s 2 24s 6 The GCF is. Divide each term of the trinomial by. 18s 2 24s 6 So, 18s 2 24s Expand, then simplify: (t 9)(t 5) Use the distributive property. (t 9)(t 5) t( ) 9( ) t( ) t( ) 9( ) 9( ) Copyright 2011 Pearson Canada Inc. 185
54 3. Factor x 2 5x 6. The sum of the factors is. The product of the factors is. Factors of ( ) ( ) ( ) ( ) Sum of the factors So, x 2 5x Expand, then simplify. (3a 5)( 2a 6) 3a( ) 5( ) 3a( ) 3a( ) 5( ) 5( ) 5. Factor 3u 2 11u 6. 3u 2 11u 6 The 1st term is. The 3rd term is. The factors of are: The factors of are: Write only the and and ; and factors of. Write each pair of factors of next to the pair of factors of. Find the products. [ ( )] [ ( )] [ ( )] [ ( )] [ ( )] [ ( )] [ ( )] [ ( )] The binomial factors are ( )( ). So, 3u 2 11u 6 Stop when you get as the sum of the products Copyright 2011 Pearson Canada Inc.
55 3.7 Multiplying Polynomials FOCUS Multiply polynomials. We used the distributive property to multiply two binomials. We can use the same property to multiply two polynomials. Example 1 Multiplying Polynomials with Positive Terms Expand, then simplify and verify. a) (3n)(2n 2 4n 5) b) (5p 2)(3p 2 2p 4) Solution a) (3n)(2n 2 4n 5) Multiply each term in the trinomial by 3n. 3n(2n 2 ) 3n(4n) 3n(5) (3 2 n n 2 ) (3 4 n n) (3 5 n) 6n 3 12n 2 15n Verify. Substitute n 2. Left side Right side (3n)(2n 2 4n 5) 6n 3 12n 2 15n (3 2)( ) (6)(8 8 5) (6)(21) The numbers match, so the product is likely correct. Multiply the numbers, then multiply the variables. We could choose any value for n. We chose 2 because it is easy to work with. b) (5p 2)(3p 2 2p 4) 5p(3p 2 2p 4) 2(3p 2 2p 4) 5p(3p 2 ) 5p(2p) 5p(4) 2(3p 2 ) 2(2p) 2(4) 15p 3 10p 2 20p 6p 2 4p 8 15p 3 10p 2 6p 2 20p 4p 8 15p 3 16p 2 24p 8 Verify. Substitute p 2. Left side Right side (5p 2)(3p 2 2p 4) 15p 3 16p 2 24p 8 (5 2 2)( ) (10 2)(12 4 4) (12)(20) The numbers match, so the product is likely correct. Multiply each term in the trinomial by each term in the binomial. Group like terms, then combine them Copyright 2011 Pearson Canada Inc. 187
56 Check 1. Expand, then simplify and verify. (3z 4)(2z 2 4z 7) 3z(2z 2 4z 7) 4(2z 2 4z 7) 3z( ) 3z( ) 3z( ) 4( ) 4( ) 4( ) z 3 z 2 z z 2 z z 3 z 2 z 2 z z z 3 z 2 z Verify. Substitute z 2. Left side Right side (3z 4)(2z 2 4z 7) z 3 z 2 z ( 2 )( ) 2 ( )( ) ( )( ) The numbers match, so the product is likely correct. Example 2 Multiplying Polynomials with Negative Terms Expand, then simplify and verify. a) ( 5p)(3p 2 2p 4) b) (4n 2)( 2n 2 4n 5) Solution a) ( 5p)(3p 2 2p 4) ( 5p)(3p 2 ) ( 5p)(2p) ( 5p)( 4) [( 5) 3 p p 2 ] [( 5) 2 p p] [( 5) ( 4) p] 15p 3 ( 10p 2 ) (20p) 15p 3 10p 2 20p Multiply each term in the trinomial by 5p. As you multiply, Verify. Substitute p 2. check the signs. Left side Right side ( 5p)(3p 2 2p 4) 15p 3 10p 2 20p (( 5) 2)( ) ( 15) ( 10)(12 4 4) ( 10)(12) The numbers match, so the product is likely correct Copyright 2011 Pearson Canada Inc.
57 b) (4n 2)( 2n 2 4n 5) 4n( 2n 2 4n 5) 2( 2n 2 4n 5) Multiply each term in the 4n( 2n 2 ) 4n( 4n) 4n( 5) 2( 2n 2 trinomial by each term in ) 2( 4n) 2( 5) the binomial. 8n 3 ( 16n 2 ) ( 20n) ( 4n 2 ) ( 8n) ( 10) 8n 3 16n 2 20n 4n 2 8n 10 8n 3 16n 2 4n 2 20n 8n 10 8n 3 12n 2 12n 10 Verify. Substitute n 2. Left side Right side (4n 2)( 2n 2 4n 5) 8n 3 12n 2 12n 10 (4 2 2)(( 2) ) ( 8) (8 2)( 8 8 5) (6)( 21) The numbers match, so the product is likely correct. Check 1. Expand, then simplify and verify. (3n 1)(4n 2 6n 2) 3n( ) 1( ) 3n( ) 3n( ) 3n ( ) 1( ) 1( ) 1( ) n 3 ( n 2 ) ( n) ( n 2 ) ( n) ( ) n 3 n 2 n n 2 n n 3 n 2 n 2 n n Verify. Substitute n 2. Left side Right side (3n 1)(4n 2 6n 2) ( 2 )( ) ( )( ) ( )( ) The numbers match, so the product is likely correct. Practice 1. Expand, then simplify. a) (5n)(3n 2 2n 1) Multiply each term in the by. 5n( ) 5n( ) 5n( ) Copyright 2011 Pearson Canada Inc. 189
58 b) (4b 3)(2b 2 4b 3) 4b( ) 3( ) 4b( ) 4b( ) 4b( ) 3( ) 3( ) 3( ) b 3 b 2 b b 2 b b 3 b 2 b 2 b b 2. Expand, then simplify. Verify for parts a and b. a) (2n)( 2n 2 4n 5) 2n( ) 2n( ) 2n( ) Verify. Substitute n 2. Left side Right side (2n)( 2n 2 4n 5) The numbers match, so the product is likely correct. b) (4b 5)(b 2 7b 8) 4b( ) 5( ) 4b( ) 4b( ) 4b ( ) 5( ) 5( ) 5( ) b 3 b 2 b b 2 b Verify. Substitute b 2. Left side Right side (4b 5)(b 2 7b 8) The numbers match, so the product is likely correct. c) ( 4y 3)(4y 2 3y 7) Copyright 2011 Pearson Canada Inc.
59 3.8 Factoring Special Polynomials FOCUS Factor special polynomials. When we multiply a binomial by itself, we square the binomial. There are patterns in the terms. (a 4) 2 (a 4)(a 4) (a 4) 2 a 2 8a 16 a 2 4a 4a 16 a 2 8a 16 (a) 2 2(4)(a) (4) 2 (t 3) 2 (t 3)(t 3) (t 3) 2 t 2 6t 9 t 2 3t 3t 9 t 2 6t 9 (t) 2 2( 3)(t) ( 3) 2 (5n 3) 2 (5n 3)(5n 3) (5n 3) 2 25n 2 30n 9 25n 2 15n 15n 9 25n 2 30n 9 (5n) 2 2(3)(5n) (3) 2 (3a 4) 2 (3a 4)(3a 4) (3a 4) 2 9a 2 24a 16 9a 2 12a 12a 16 9a 2 24a 16 (3a) 2 2( 4)(3a) ( 4) 2 Each trinomial above is a perfect square trinomial. We can use these patterns to factor perfect square trinomials. Example 1 Factoring Perfect Square Trinomials Factor each perfect square trinomial. a) w 2 14w 49 b) 25n 2 20n 4 Solution a) w 2 14w 49 b) 25n 2 20n 4 The 2nd term is negative, The 2nd term is positive, so the factors of 49 are negative. so the factors of 4 are positive. w 2 14w 49 25n 2 20n 4 (w) 2 ( 7) 2 (5n) 2 (2) 2 So, w 2 14w 49 (w 7)(w 7) So, 25n 2 20n 4 (5n 2)(5n 2) (w 7) 2 (5n 2) 2 You can expand to check the factors Copyright 2011 Pearson Canada Inc. 191
60 Check 1. Factor each perfect square trinomial. a) r 2 6r 9 b) 9m 2 12m 4 The 2nd term is, The 2nd term is, so the factors of 9 are. so the factors of are. r 2 6r 9 9m 2 12m 4 ( ) 2 ( ) 2 ( ) 2 ( ) 2 So, r 2 6r 9 So, 9m 2 12m 4 ( )( ) ( ) 2 ( ) 2 All the binomial products you have seen so far produce trinomials. There are special binomial products that produce binomials. There are patterns in the terms. (a 4)(a 4) a 2 4a 4a 16 (a 4)(a 4) a 2 16 a 2 16 (a) 2 (4) 2 (t 3)(t 3) t 2 3t 3t 9 (t 3)(t 3) t 2 9 t 2 9 (t) 2 (3) 2 (5n 3)(5n 3) 25n 2 15n 15n 9 (5n 3)(5n 3) 25n n 2 9 (5n) 2 (3) 2 (3a 4)(3a 4) 9a 2 12a 12a 16 (3a 4)(3a 4) 9a a 2 16 (3a) 2 (4) 2 Each binomial above is a difference of squares. We can use these patterns to factor a difference of squares. Example 2 Factoring a Difference of Squares Factor each difference of squares. a) x 2 64 b) 4v 2 49 Solution a) x 2 64 b) 4v 2 49 Write 64 as a perfect square: Write 4v 2 as a perfect square: v 2 2v 2v, or (2v) 2 x 2 64 x Write 49 as a perfect square: (x 8)(x 8) 4v 2 49 (2v) (2v 7)(2v 7) Copyright 2011 Pearson Canada Inc.
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