Answer
4xy
Work Step by Step
$(x + y)^2$ - $(x - y)^2$
Now, $a^2$ - $b^2$ = (a+b)(a-b)
and a = x+y , b = x-y
Which implies,
= ((x+y) + (x-y))((x+y) - (x-y))
= (2x)(2y)
= 4xy
which is the answer
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.4 Factoring Polynomials - R.4 Exercises - Page 44: 113
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