Answer
-6
Work Step by Step
$\sqrt -4\times\sqrt -9=i\sqrt 4\times i\sqrt 9=2i\times3i=2\times3\times i^{2}=6\times-1=-6$
We know that $\sqrt -1=i$, because $i^{2}=-1$.
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 8 - Section 8.1 - Complex Numbers - 8.1 Problem Set - Page 425: 23
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