Answer
$3\sqrt7$
Work Step by Step
Rationalize the denominator by multiplying $\sqrt7$ to both the numerator and the denominator:
$=\dfrac{21\sqrt7}{\sqrt7(\sqrt7)}
\\=\dfrac{21\sqrt7}{7}
\\=3\sqrt7$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - 5.4 The Irrational Numbers - Exercise Set 5.4 - Page 296: 59
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