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: 24

Answer

-27

Work Step by Step

$\sqrt -9\times\sqrt -81=i\sqrt 9\times i\sqrt 81=i\times3\times i\times9=27i^{2}=27\times-1=-27$ We know that $\sqrt -1=i$, because $i^{2}=-1$.
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