Answer
$81x^2+126xy+49y^2$
Work Step by Step
RECALL:
$(a+b)^2=a^2+2ab+b^2$
Use the formula above with $a=9x$ and $b=7y$ to obtain:
$=(9x)^2+2(9x)(7y) + (7y)^2
\\=81x^2+126xy+49y^2$
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: 66
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