College Algebra (6th Edition)

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: 74



Work Step by Step

$$(9x+7y)^2$$ $$=(9x+7y)(9x+7y)$$ $$=(9x\times 9x)+(9x\times 7y)+(7y\times 9x)+(7y\times 7y)$$ $$=81x^2+63xy+63xy+49y^2$$ $$=81x^2+126xy+49y^2$$
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