Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Review Exercises: 87

Answer

$\boxed{49x^2-16y^2}$

Work Step by Step

Recall that $(a+b)(a-b)=a^2-b^2$. Thus, $(7x+4y)(7x-4y)=49x^2-16y^2$
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