Answer
$x-y$
Work Step by Step
Use the formula $a^2-b^2=(a-b)(a+b)$, we have $(\sqrt x-\sqrt y)(\sqrt x+\sqrt y)=(\sqrt x)^2-(\sqrt y)^2=x-y$
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 - Test - Page 86: 27
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