Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 3 - Polynomial and Rational Functions - Section 3.2 The Real Zeros of a Polynomial Function - 3.2 Assess Your Understanding - Page 223: 2

Answer

$(2x-1)(3x+2)$

Work Step by Step

We have a quadratic expression $ax^2+bx+c=6x^2+x-2$. We have: $a=6$ and $c=-2$, then $ac=6(-2)=-12$. Look for factors of $-12$ whose sum is equal to the middle term's coefficient, which is $1$, and use these factors to rewrite the middle term. The factors of $-12$ whose sum are $4$ and $-3$. Rewrite the middle term using these factors and factor by groupingto obtain: $6x^2+x-2\\ =6x^2-3x+4x-2 \\ =(6x^2-3x)+(4x-2)\\ = 3x(2x-1)+2(2x-1)\\ =(2x-1)(3x+2)$
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