Answer
$\dfrac{12\sqrt5}{5}$
Work Step by Step
Rationalize the denominator by multiplying $\sqrt5$ to both the numerator and the denominator:
$=\dfrac{12\sqrt5}{\sqrt5(\sqrt5)}
\\=\dfrac{12\sqrt5}{5}$
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: 58
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