Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 1 - Equations and Inequalities - 1.3 Complex Numbers - 1.3 Exercises: 38

Answer

$i \sqrt 2$

Work Step by Step

$\frac{\sqrt {-40}}{\sqrt {20}} = \sqrt {\frac{-40}{20}} = \sqrt {-2} = \sqrt {-1\times2} = i \sqrt 2$
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