Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 6 - Algebra: Equations and Inequalities - 6.5 Quadratic Equations - Exercise Set 6.5 - Page 399: 7


$12x^{2}$ - 43x +35

Work Step by Step

Two binomials can be quickly multiplied by using the FOIL method, in which F represents the product of the first terms in each binomial, O represents the product of the outside terms, I represents the product of the two inside terms, and L represents the product of the last, (3x-7)(4x - 5) F = 3x.4x = $12x^{2}$ O = 3x.-5 = -15x I = -7. 4x= -28x L = -7.-5 = 35 (3x-7)(4x -5) = $12x^{2}$ -15x -28x + 35 combine like terms $12x^{2}$ - 43x +35
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