Trigonometry 7th Edition

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: 26

Answer

-8

Work Step by Step

$\sqrt -16\times\sqrt -4=i\sqrt 16\times i\sqrt 4=4i\times 2i=4\times2\times i^{2}=8\times-1=-8$ We know that $\sqrt -1=i$, because $i^{2}=-1$.
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