Answer
$9x^{2}+42xy+49y^{2}$
Work Step by Step
$(3x+7y)^{2}$
$=(3x+7y)(3x+7y)$
$=3x(3x+7y)+7y(3x+7y)$
$=9x^{2}+21xy+21xy+49y^{2}$
$=9x^{2}+42xy+49y^{2}$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 3 - Exponents, Polynomials and Functions - 3.2 Combining Functions - 3.2 Exercises - Page 244: 43
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