Answer
$9x^2+x$
Work Step by Step
Combine like terms to obtain:
$=(7x^2+2x^2) +(5x-4x)
\\=(7+2)x^2 + (5-4)x
\\=9x^2+x$
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 1 - Review Exercises - Page 98: 43
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