Answer
$3$
Work Step by Step
Use the formula $(a+b)(a-b)=a^2-b^2$ to obtain:
$=(\sqrt5)^2-(\sqrt2)^2
\\=5-2
\\=3$
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.7 Radical Expressions - R.7 Exercises - Page 75: 86
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