Answer
$19\sqrt2i$
Work Step by Step
Since $i=\sqrt{-1}$ here: $5\sqrt{-8}+3\sqrt{-18}=5\sqrt{4}\sqrt{-1}\sqrt2+3\sqrt{9}\sqrt{-1}\sqrt2=5(2)\sqrt2i+3(3)\sqrt2i=19\sqrt2i$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 570: 106
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