Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 9 - Roots and Radicals - Chapter 9 Test - Page 431: 6


$3\sqrt 5$

Work Step by Step

Recall the following rule: $\sqrt{x^{2}}=x$. Thus, we obtain: $\sqrt {45}=\sqrt {9\times5}=\sqrt {3^{2}}\times\sqrt 5=3\times\sqrt 5=3\sqrt 5$
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