Answer
$5i$
Work Step by Step
Use basic root properties $\sqrt{a}\sqrt{b}=\sqrt{ab}$ to simplify :
$\sqrt{-25}$
$=\sqrt{25\times-1}$
$=\sqrt{25}\sqrt{-1}$
$=\sqrt{25}i$
$=5i$
Multivariable Calculus, 7th Edition
by Stewart, James
Published by
Brooks Cole
ISBN 10:
0-53849-787-4
ISBN 13:
978-0-53849-787-9
Appendix G - Exercises - Page A12: 13
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