Answer
$3i$
Work Step by Step
Make the square roots positive by moving the $i$ out of the radical. Then combine like terms.
$\sqrt {-64}-\sqrt {-25}$
$i\sqrt {64}-i\sqrt {25}$
$8i-5i$
$3i$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 1 - Equations and Inequalities - Exercise Set 1.4 - Page 142: 29
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