Precalculus (6th Edition)

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: 86

Answer

$3$

Work Step by Step

Use the formula $(a+b)(a-b)=a^2-b^2$ to obtain: $=(\sqrt5)^2-(\sqrt2)^2 \\=5-2 \\=3$
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