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Unformatted text preview: 6.3 Factoring Trinomials of the Form ax 2 + bx + c and Perfect Square Trinomials MartinGay, Beginning and Intermediate Algebra, 4ed 2 Factoring Trinomials Returning to the FOIL method, F O I L (3 x + 2)( x + 4) = 3 x 2 + 12 x + 2 x + 8 = 3 x 2 + 14 x + 8 To factor a x 2 + b x + c into (# 1 x + # 2 )(# 3 x + # 4 ), note that a is the product of the two first coefficients, c is the product of the two last coefficients and b is the sum of the products of the outside coefficients and inside coefficients. Note that b is the sum of 2 products, not just 2 numbers, as in the last section. MartinGay, Beginning and Intermediate Algebra, 4ed 3 Factor the polynomial 21 x 2 41 x + 10. Possible factors of 21 x 2 are { x , 21 x } or {3 x , 7 x }. Since the middle term is negative, possible factors of 10 must both be negative: {1, 10} or {2, 5}. We need to methodically try each pair of factors until we find a combination that works, or exhaust all of our possible pairs of factors. Factoring Polynomials Continued. Example: MartinGay, Beginning and Intermediate Algebra, 4ed 4 We will be looking for a combination that gives the sum of the products of the outside terms and the inside terms equal to  41 x . Factors of 21 x 2 Resulting Binomials Product of Outside Terms Product of Inside Terms Sum of Products Factors of 10 { x , 21 x }{1, 10}( x 1 )( 21 x 10 ) 10 x 21 x 31 x ( x 10 )( 21 x 1 ) x 210 x 211 x { x , 21 x } {2, 5} ( x 2 )( 21 x 5 ) 5 x 42 x 47 x ( x 5 )( 21 x 2 ) 2 x 105 x 107 x Factoring Polynomials Continued. Example continued: MartinGay, Beginning and Intermediate Algebra, 4ed 5 Factors of 21 x 2 Resulting Binomials Product of Outside Terms Product of Inside Terms Sum of Products Factors of 10 ( 3 x 5 )( 7 x 2 )  6 x 35 x 41 x {3 x , 7 x }{1, 10}( 3 x 1 )( 7 x 10 )  30 x 7 x 37 x ( 3 x 10 )( 7 x 1 )  3 x 70 x 73 x {3 x , 7 x } {2, 5} ( 3 x 2 )( 7 x 5 )  15 x 14 x 29 x Factoring Polynomials Continued....
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This note was uploaded on 11/04/2011 for the course MATH 103 taught by Professor Alraban during the Fall '10 term at Montgomery College.
 Fall '10
 Alraban
 Math, Factoring, Factoring Trinomials

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