# Factoring - Factoring Special Products

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1 6.5 Factoring - Factoring Special Products Objective: Identify and factor special products including a difference of squares, perfect squares, and sum and difference of cubes. When factoring there are a few special products that, if we can recognize them, can help us factor polynomials. The first is one we have seen before. When multiplying special products we found that a sum and a difference could multiply to a difference of squares. Here we will use this special product to help us factor Difference of Squares: a 2 b 2 = (a + b)(a b) If we are subtracting two perfect squares then it will always factor to the sum and difference of the square roots. Example 1. x 2 16 (x + 4)(x 4) Our Solution Subtracting two perfect squares, the square roots arexand4 Example 2. 9a 2 25b 2 (3a +5b)(3a 5b) Our Solution Subtracting two perfect squares, the square roots are 3a and5b It is important to note, that a sum of squares will never factor. It is always prime. This can be seen if we try to use the ac method to factor x Example 3. x Nobx term, we use0x. x 2 + 0x + 36 Multiply to 36, add to , 2 18,3 12,4 9, 6 6 No combinations that multiply to 36 add to 0 Prime, cannot factor Our Solution It turns out that a sum of squares is always prime. Sum of Squares: a 2 + b 2 = Prime 1

2 A great example where we see a sum of squares comes from factoring a difference of 4th powers. Because the square root of a fourth power is a square ( a 4 = a 2 ), we can factor a difference of fourth powers just like we factor a difference of squares, to a sum and difference of the square roots. This will give us two factors, one which will be a prime sum of squares, and a second which will be a difference of squares which we can factor again. This is shown in the following examples. Example 4. a 4 b 4 Difference of squares with rootsa 2 and b 2 (a 2 +b 2 )(a 2 b 2 ) The first factor is prime, the second isadifference of squares! (a 2 +b 2 )(a +b)(a b) Our Solution Example 5. x 4 16 Difference of squares with rootsx 2 and 4 (x 2 + 4)(x 2 4) The first factor is prime, the second isadifference of squares! (x 2 + 4)(x +2)(x 2) Our Solution Another factoring shortcut is the perfect square. We had a shortcut for multiplying a perfect square which can be reversed to help us factor a perfect square Perfect Square: a 2 + 2ab + b 2 = (a + b) 2 A perfect square can be difficult to recognize at first glance, but if we use the ac method and get two of the same numbers we know we have a perfect square. Then we can just factor using the square roots of the first and last terms and the sign from the middle. This is shown in the following examples. Example 6. x 2 6x + 9 Multiply to 9, add to 6 The numbers are 3 and 3, the same! Perfect square (x 3) 2 Use square roots from first and last terms and sign from the middle Example 7. 4x xy + 25y 2 Multiply to 100, add to 20 The numbers are 10 and 10, the same! Perfect square (2x + 5y) 2 Usesquareroots fromfirstandlastterms andsignfromthemiddle 2

3 World View Note: The first known record of work with polynomials comes from the Chinese around 200 BC. Problems would be written as three sheafs of a good crop, two sheafs of a mediocre crop, and one sheaf of a bad crop sold for 29 dou. This would be the polynomial (trinomial) 3x + 2y + z = 29. Another factoring shortcut has cubes. With cubes we can either do a sum or a difference of cubes. Both sum and difference of cubes have very similar factoring formulas Sum of Cubes: a 3 + b 3 = (a + b)(a 2 ab + b 2 ) Difference of Cubes: a 3 b 3 = (a b)(a 2 + ab + b 2 ) Comparing the formulas you may notice that the only difference is the signs in between the terms. One way to keep these two formulas straight is to think of SOAP. S stands for Same sign as the problem. If we have a sum of cubes, we add first, a difference of cubes we subtract first. O stands for Opposite sign. If we have a sum, then subtraction is the second sign, a difference would have addition for the second sign. Finally, AP stands for Always Positive. Both formulas end with addition. The following examples show factoring with cubes. Example 8. m 3 27 We have cube rootsmand 3 (m 3)(m 2 3m 9) Use formula, use SOAP to fill in signs (m 3)(m 2 + 3m +9) Our Solution Example p 3 +8r 3 We have cube roots 5p and2r (5p 2r)(25p 2 10r 4r 2 ) Use formula, use SOAP to fill in signs (5p+2r)(25p 2 10r +4r 2 ) Our Solution The previous example illustrates an important point. When we fill in the trinomial s first and last terms we square the cube roots 5p and 2r. Often students forget to square the number in addition to the variable. Notice that when done correctly, both get cubed. Often after factoring a sum or difference of cubes, students want to factor the second factor, the trinomial further. As a general rule, this factor will always be prime (unless there is a GCF which should have been factored out before using cubes rule). 3

4 The following table sumarizes all of the shortcuts that we can use to factor special products Factoring Special Products Difference of Squares a 2 b 2 = (a+b)(a b) Sum of Squares a 2 +b 2 = Prime Perfect Square a 2 +2ab +b 2 = (a +b) 2 Sum of Cubes a 3 +b 3 =(a +b)(a 2 ab +b 2 ) Difference of Cubes a 3 b 3 = (a b)(a 2 +ab +b 2 ) As always, when factoring special products it is important to check for a GCF first. Only after checking for a GCF should we be using the special products. This is shown in the following examples Example x 2 2 GCF is 2 2(36x 2 1) Difference of Squares, square roots are 6x and 1 2(6x +1)(6x 1) Our Solution Example x 2 y 24xy +3y GCF is 3y 3y(16x 2 8x+1) Multiply to 16 add to 8 The numbers are 4 and 4, the same! Perfect Square 3y(4x 1) 2 Our Solution Example a 4 b ab 5 GCF is 2ab 2 2ab 2 (64a b 3 ) Sum of cubes! Cube roots are 4a and 3b 2ab 2 (4a +3b)(16a 2 12ab + 9b 2 ) Our Solution Beginning and Intermediate Algebra by Tyler Wallace is licensed under a Creative Commons Attribution 3.0 Unported License. ( 4

5 6.5 Practice - Factoring Special Products Factor each completely. 1) r ) v ) p 2 4 7) 9k 2 4 9) 3x ) 16x ) 18a 2 50b 2 15) a 2 2a +1 17) x 2 + 6x+9 19) x 2 6x ) 25p 2 10p +1 23) 25a ab +9b 2 25) 4a 2 20ab + 25b 2 27) 8x 2 24xy + 18y 2 29) 8 m 3 31) x ) 216 u 3 35) 125a ) 64x y 3 39) 54x y 3 41) a ) 16 z 4 45) x 4 y 4 47) m 4 81b 4 2) x 2 9 4) x 2 1 6) 4v 2 1 8) 9a ) 5n ) 125x y 2 14) 4m n 2 16) k 2 +4k +4 18) n 2 8n ) k 2 4k ) x 2 + 2x+1 24) x 2 + 8xy + 16y 2 26) 18m 2 24mn +8n 2 28) 20x xy +5y 2 30) x ) x ) 125x ) 64x ) 32m 3 108n 3 40) 375m n 3 42) x ) n ) 16a 4 b 4 48) 81c 4 16d 4 Beginning and Intermediate Algebra by Tyler Wallace is licensed under a Creative Commons Attribution 3.0 Unported License. ( 5

6 6.5 Answers - Factoring Special Products 1) (r + 4)(r 4) 2) (x +3)(x 3) 3) (v + 5)(v 5) 4) (x +1)(x 1) 5) (p+2)(p 2) 6) (2v + 1)(2v 1) 7) (3k + 2)(3k 2) 8) (3a +1)(3a 1) 9) 3(x +3)(x 3) 10) 5(n +2)(n 2) 11) 4(2x +3)(2x 3) 12) 5(25x 2 + 9y 2 ) 13) 2(3a+5b)(3a 5b) 14) 4(m n 2 ) 15) (a 1) 2 16) (k + 2) 2 17) (x +3) 2 18) (n 4) 2 19) (x 3) 2 20) (k 2) 2 21) (5p 1) 2 22) (x +1) 2 23) (5a+3b) 2 24) (x +4y) 2 25) (2a 5b) 2 26) 2(3m 2n) 2 27) 2(2x 3y) 2 28) 5(2x + y) 2 29) (2 m)(4+2m +m 2 ) 30) (x +4)(x 2 4x + 16) 31) (x 4)(x 2 + 4x + 16) 32) (x +2)(x 2 2x +4) 33) (6 u)(36 + 6u +u 2 ) 34) (5x 6)(25x x+36) 35) (5a 4)(25a a + 16) 36) (4x 3)(16x x+9) 37) (4x +3y)(16x 2 12xy + 9y 2 ) 38) 4(2m 3n)(4m 2 +6mn +9n 2 ) 39) 2(3x +5y)(9x 2 15xy + 25y 2 ) 40) 3(5m +6n)(25m 2 30mn + 36n 2 ) 41) (a 2 +9)(a+3)(a 3) 42) (x )(x +4)(x 4) 43) (4+z 2 )(2+z)(2 z) 44) (n 2 +1)(n+1)(n 1) 45) (x 2 + y 2 )(x + y)(x y) 46) (4a 2 +b 2 )(2a+b)(2a b) 47) (m 2 + 9b 2 )(m +3b)(m 3b) 48) (9c 2 +4d 2 )(3c +2d)(3c 2d) Beginning and Intermediate Algebra by Tyler Wallace is licensed under a Creative Commons Attribution 3.0 Unported License. ( 6

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### MATD 0390 - Intermediate Algebra Review for Pretest MATD 090 - Intermediate Algebra Review for Pretest. Evaluate: a) - b) - c) (-) d) 0. Evaluate: [ - ( - )]. Evaluate: - -(-7) + (-8). Evaluate: - - + [6 - ( - 9)]. Simplify: [x - (x - )] 6. Solve: -(x +

### Section A-3 Polynomials: Factoring APPLICATIONS. A-22 Appendix A A BASIC ALGEBRA REVIEW A- Appendi A A BASIC ALGEBRA REVIEW C In Problems 53 56, perform the indicated operations and simplify. 53. ( ) 3 ( ) 3( ) 4 54. ( ) 3 ( ) 3( ) 7 55. 3{[ ( )] ( )( 3)} 56. {( 3)( ) [3 ( )]} 57. Show by Factoring the trinomial ax 2 + bx + c when a = 1 A trinomial in the form x 2 + bx + c can be factored to equal (x + m)(x + n) when the product of m x n equals c and the sum of m + n equals b. (Note: the

### Polynomial Equations and Factoring 7 Polynomial Equations and Factoring 7.1 Adding and Subtracting Polynomials 7.2 Multiplying Polynomials 7.3 Special Products of Polynomials 7.4 Dividing Polynomials 7.5 Solving Polynomial Equations in

### Factoring. Factoring Monomials Monomials can often be factored in more than one way. Factoring Factoring is the reverse of multiplying. When we multiplied monomials or polynomials together, we got a new monomial or a string of monomials that were added (or subtracted) together. For example,

### 15.1 Factoring Polynomials LESSON 15.1 Factoring Polynomials Use the structure of an expression to identify ways to rewrite it. Also A.SSE.3? ESSENTIAL QUESTION How can you use the greatest common factor to factor polynomials? EXPLORE

### A. Factoring out the Greatest Common Factor. DETAILED SOLUTIONS AND CONCEPTS - FACTORING POLYNOMIAL EXPRESSIONS Prepared by Ingrid Stewart, Ph.D., College of Southern Nevada Please Send Questions and Comments to ingrid.stewart@csn.edu. Thank you!

### Factor Polynomials Completely 9.8 Factor Polynomials Completely Before You factored polynomials. Now You will factor polynomials completely. Why? So you can model the height of a projectile, as in Ex. 71. Key Vocabulary factor by grouping 8. Radicals - Multiply and Divide Radicals Objective: Multiply and divide radicals using the product and quotient rules of radicals. Multiplying radicals is very simple if the index on all the radicals Dear Parents, Based on the results of the High School Placement Test (HSPT), your child should forecast to take Algebra 1 this fall. If you are okay with that placement then you have no further action