College Algebra (6th Edition)

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: 8

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) $ $=i \sqrt 4 \times \sqrt 5$ $= 2i\sqrt 5$
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