#### Answer

-20

#### Work Step by Step

$\sqrt 400=20$, which we know because $20^{2}=20\times20=400$
Therefore, $-\sqrt 400=-(20)=-20$.

Published by
Pearson

ISBN 10:
0321969359

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

-20

$\sqrt 400=20$, which we know because $20^{2}=20\times20=400$
Therefore, $-\sqrt 400=-(20)=-20$.

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