Answer
$9x^2+12x$
Work Step by Step
Rearrange and group like terms, and then simplify using the distributive property to find:
$=(5x^2+4x^2)+(9x+3x)
\\=(5+4)x^2+(9+3)x
\\=9x^2+12x$
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 - Section 1.2 - Operations with Real Numbers and Simplifying Algebraic Expressions - Exercise Set - Page 28: 122
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