Answer
$-x^3+4x^2+6x+17$
Work Step by Step
$(-8x^3+6x^2-x+5)-(-7x^3+2x^2-7x-12)=\\=(-8x^3+7x^3)+(6x^2-2x^2)+(-x+7x)+(5+12)\\=-x^3+4x^2+6x+17$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 5 - Mid-Chapter Check Point - Page 364: 1
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