Thinking Mathematically (6th Edition)

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: 61

Answer

$\dfrac{2\sqrt{30}}{5}$

Work Step by Step

Rationalize the denominator by multiplying $\sqrt{30}$ to both the numerator and denominator: $=\dfrac{12\sqrt{30}}{\sqrt{30}(\sqrt{30})} \\=\dfrac{12\sqrt{30}}{30}$ Cancel the common factor, 6, to find: $=\dfrac{2\sqrt{30}}{5}$
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