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 $i^{2}=-1$.
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter 7 - Section 7.7 - Complex Numbers - 7.7 Exercises - Page 491: 24
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