#### Answer

$9x^2+12x$

#### Work Step by Step

Rearrange and group like terms, and then simplify using the distributive property to find:
$=(5x^2+4x^2)+(9x+3x)
\\=(5+4)x^2+(9+3)x
\\=9x^2+12x$

Published by
Pearson

ISBN 10:
0-13417-894-7

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

$9x^2+12x$

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