Answer
$3x^{2}-9x+15$
Work Step by Step
$3x^{2}-4x+8-(5x-7)$
$= 3x^{2}-4x+8-5x+7$
Combine like terms.
$= 3x^{2}-4x-5x+8+7$
$= 3x^{2}-9x+15$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.3 - Polynomials and Polynomial Functions - Exercise Set - Page 280: 75
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