#### Answer

$8i \sqrt{5}$

#### Work Step by Step

$4 \sqrt{-20} = 4 \cdot \sqrt{-1} \cdot \sqrt{20} = 4 \cdot \sqrt{-1} \cdot \sqrt{4 \cdot 5} = 8i \sqrt{5}$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$8i \sqrt{5}$

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