Answer
$40xy$
Work Step by Step
Using the formula $A^2-B^2=(A+B)(A-B)$, we have
$(5x+2y)^2-(5x-2y)^2=((5x+2y)+(5x-2y))((5x+2y)-(5x-2y))=(10x)(4y)=40xy$
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 - Section P.4 - Polynomials - Exercise Set - Page 56: 84
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