Answer
$-7$
Work Step by Step
Use the formula $(a+b)(a-b)=a^2-b^2$ to obtain:
$=(\sqrt2)^2-3^2
\\=2-9
\\=-7$
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: 85
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