Answer
$49x^2+70xy+25y^2$
Work Step by Step
RECALL:
$(a+b)^2=a^2+2ab+b^2$
Use the formula above with $a=7x$ and $b=5y$ to obtain:
$=(7x)^2+2(7x)(5y) + (5y)^2
\\=49x^2+70xy+25y^2$
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: 65
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