Answer
$4x^2+12x+9$
Work Step by Step
RECALL:
$(a+b)^2=a^2+2ab+b^2$
Use the formula above with $a=2x$ and $b=3$ to obtain:
$=(2x)^2+2(2x)(3) + 3^2
\\=4x^2+12x+9$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.4 - Polynomials - Exercise Set - Page 56: 43
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