Answer
$81x^2+126xy+49y2$
Work Step by Step
$$(9x+7y)^2$$ $$=(9x+7y)(9x+7y)$$ $$=(9x\times 9x)+(9x\times 7y)+(7y\times 9x)+(7y\times 7y)$$ $$=81x^2+63xy+63xy+49y^2$$ $$=81x^2+126xy+49y^2$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.4 - Page 61: 74
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