Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 7 - Section 7.7 - Complex Numbers - 7.7 Exercises: 18

Answer

$i\sqrt 21$

Work Step by Step

$\sqrt -21=\sqrt (-1\times21)=\sqrt -1\times\sqrt 21=(i\times\sqrt 21)=i\sqrt 21$ We know that $\sqrt -1=i$, because $i^{2}=-1$.
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