#### Answer

$-5\sqrt 5$

#### Work Step by Step

$-\sqrt 125=-(\sqrt (25\times5))=-(\sqrt 25\times\sqrt 5)=-(5\sqrt 5)=-5\sqrt 5$
We know that $\sqrt 25=5$, because $5^{2}=25$.

Published by
Pearson

ISBN 10:
0321969359

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

$-5\sqrt 5$

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