Answer
$\boxed{49x^2-16y^2}$
Work Step by Step
Recall that $(a+b)(a-b)=a^2-b^2$.
Thus, $(7x+4y)(7x-4y)=49x^2-16y^2$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Review Exercises - Page 143: 87
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