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: 24

Answer

$ i\sqrt {15}$

Work Step by Step

$\sqrt {-15} = \sqrt {-1} \sqrt {15} = i\sqrt {15}$ Because $\sqrt {-1} = i$
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