Answer
$9x^2+49y^2+42xy$
Work Step by Step
Given:$(3x+7y)^2$
Open the given polynomials by applying sum formula of polynomials.
This implies
$=(3x)^2+(7y)^2+2(3x)(7y)$
or, $=9x^2+49y^2+42xy$
Hence, the result is : $9x^2+49y^2+42xy$
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 5 - Review Exercises - Page 400: 22
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