#### Answer

$i\sqrt20$

#### Work Step by Step

$\sqrt -10\times\sqrt 2=i\sqrt 10\times \sqrt 2=i\sqrt(10\times2)=i\sqrt20$
We know that $\sqrt -1=i$, because $i^{2}=-1$.

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

$i\sqrt20$

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