Answer
$\sqrt -20=i\sqrt 20 = i\sqrt (4 \times 5) = 2i\sqrt 5$
Work Step by Step
Using $\sqrt -b = i\sqrt b$
$\sqrt -20=i\sqrt 20$
$ = i\sqrt (4 \times 5) $
$=i \sqrt 4 \times \sqrt 5$
$= 2i\sqrt 5$
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 - Concept and Vocabulary Check - Page 142: 8
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