Factoring an expression is to rewrite an expression as the product of expressions. One way to factor an expression is to find a common factor among terms. Factoring an expression produces 1 an equivalent 2 expression. If the only common factor among terms is 1, the expression cannot be factored. Which expression shows 5 b  15 factored? How do you know? A 2 b  3 b  15 B 5( b  3) Explain why the expressions 4 d  10 and 2(2 d  5) are equivalent expressions. Explain why -2 m  7 CANNOT be factored. In your own words, what is factoring an expression? “Factoring an expression _____.” CFU 1 creates (synonym) 2 equal value Vocabulary Concept Review from Factoring Expressions (Use the GCF) 9 x  6 3 is a common factor of 9 x and 6. 3(3 x  2) 9 x  6 3 is a common factor of 9 x and 6. 3(3 x  2) 9 x  6 and 3(3 x  2) are equivalent expressions. 4 d  10 2 is a common factor of 4 d and 10. 2(2 d  5) 4 d  10 2 is a common factor of 4 d and 10. 2(2 d  5) 4 d  10 and 2(2 d  5) are equivalent expressions. -2 m  7 5 a  9 CANNOT be Factored

Determine the Greatest Common Factor (GCF). Hint: Use a factor that will make the variable term positive. Rewrite each term as a product using the common factor. Rewrite the expression as a product of expressions using the common factor. Interpret 4 the factored expression. “____ is equivalent to ___ times ___.” Factor expressions figure out 4 explain (synonym) Vocabulary How did I/you determine a factor the terms have in common? How did I/you rewrite each term? How did I/you rewrite the expression? CFU a  y  b  w  (4 c  6) 6. 7  (10 x  20) Guided Practice (2 a )  7(1) 7(2 a  1) GCF: 7 “14a – 7 is equivalent to 7 times (2a – 1)” 8( y )  8(4) 8( y  4) GCF: 8 “8y + 32 is equivalent to 8 times (y + 4)” 5(3 b )  5(4) 5(3 b  4) GCF: 5 “15b + 20 is equivalent to 5 times (3b + 4)” 5[3 b  (4)] GCF: 1 “5w-12 cannot be factored any further” 3  2(2 c )  2(3) GCF: 2 “3 + (4c - 6) is equivalent to 3 plus [2 times (2c - 3)]” 3  2(2 c  3) 7  10( x )  10(2) Common Factor: 10 “7 + (10x – 20) is equivalent to 7 plus [10 times (x – 2)]” 7  10( x  2) Factoring an expression is to rewrite an expression as the product of expressions. If the only common factor among terms is 1, the expression cannot be factored.

Independent Practice v  b   (10 x  25) 4. 3 j  8 Determine a factor the terms have in common. Hint: Use a factor that will make the variable term positive. Rewrite each term as a product using the common factor. Rewrite the expression as a product of expressions using the common factor. Interpret the factored expression. “____ is equivalent to ___ times ___.” Factor expressions (3 v )  5(1) 5(3 v  1) GCF: 5 “15v – 5 is equivalent to 5 times (3v – 1)” 9(3 b )  (9)(2) 9(3 b  2) GCF: 9 “27b + 18 is equivalent to 9 times (3b + 2)” 9  5(2 x )  5(5) GCF: 5 “9 + (10x + 25) is equivalent to 9 plus [5 times (2x + 5)]” 9  5(2 x  5) GCF: 1 “3j – 8 cannot be factored because the only factor common among terms is 1.” Factoring an expression is to rewrite an expression as the product of expressions. If the only common factor among terms is 1, the expression cannot be factored. 5 x  20 7 y  56 9 z  6 5(x + 4) 7(y + 9) 3(3z - 6) 5 was factored from each term, but the + sign is incorrect. 5( x  4) 7 was factored from the first term, but +7 was factored incorrectly from the second term. 7( y  8) 3 was factored from the first term, but 3 was NOT factored from the second term. 3 (3 z  2)

HOMEWORK Determine each factor that will make the expressions equivalent. 1.A 18 d  45 = __(6 d  15) B 6 f  42 = __(3 f  21) C 12 g  14 = __(6 g  7) D 9 h  36 = __( h  4) 3.A 25 p  45 = __(5 p  9) B 16 q  4 = __(8 q  2) C 35 r  56 = __(5 r  8) D 30 u  10 = __(3 u  1) 2.A 21 j  49 = __(3 j  7) B 15 k  3 = __(5 k  1) C 56 m  28 = __(4 m  2) D 8 n  4 = __(2 n  1) Equivalent: YES or NO 1. Choose Yes or No to indicate whether each expression is equivalent to 20 h  12. A2(10 h  12) B4(5 h  3) C20( h  12) D2(10 h  6) O Yes O No 2. Choose Yes or No to indicate whether each expression is equivalent to -18 p  36. A-3(6 p  12) B6(-3 p  6) C-18( p  2) D-9(3 p  36) O Yes O No 3. Choose Yes or No to indicate whether each expression is equivalent to 45 d  15. A3(15 d  5) B45( d  15) C15(3 d ) D5(9 d  3) O Yes O No

7.EE Common Core Standard Describe and correct each error made in factoring expressions below. 2.A 15 a  20B 14 b  16 C 18 c  6 15(a - 20)4(10b + 4)6(3c - 6) 1.A 18 k  9B 24 m  6 C 12 n  3 9(2k)6(4m)3(4n) 15 is not a common factor among terms. 5(3 a  4) 4 is not a common factor among terms. 4 and 10b are multiplied, not added. 2(7 b  8) 6 was not factored out of the second term. 6(3 c  1) The 1 was left off after factoring the second term. 9(2 k  1) The 1 was left off after factoring the second term. 6(4 m  1) The 1 was left off after factoring the second term. 3(4 n  1) Factoring Expressions Which expressions below are NOT factored? Explain your answer. 3 x  9 3( x  3) 2 a  6 a  a  6 2(4 x ) The expressions are NOT factored because they have common factors that both terms have in common. Tuesday, January 13, 2015 Homework