Answer
$6i$
Work Step by Step
$\sqrt {-4}+\sqrt {-16}$
=$\sqrt {-1\times4}+\sqrt {-1\times16}$
=$(\sqrt {-1}\times\sqrt {4})+(\sqrt {-1}\times\sqrt {16})$
=$(i\times\sqrt {4})+(i\times\sqrt {16})$
=$(i\times2)+(i\times4)$
=$(2i)+(4i)$
=$6i$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Review - Page 749: 129
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