#### Answer

$9x^2+x$

#### Work Step by Step

Combine like terms to obtain:
$=(7x^2+2x^2) +(5x-4x)
\\=(7+2)x^2 + (5-4)x
\\=9x^2+x$

Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$9x^2+x$

Combine like terms to obtain:
$=(7x^2+2x^2) +(5x-4x)
\\=(7+2)x^2 + (5-4)x
\\=9x^2+x$

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