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

Published by
Pearson

ISBN 10:
0-32178-228-3

ISBN 13:
978-0-32178-228-1

$\sqrt -20=i\sqrt 20 = i\sqrt (4 \times 5) = 2i\sqrt 5$

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