#### Answer

$6\sqrt 2$

#### Work Step by Step

$\sqrt 72=\sqrt (36\times2)=\sqrt 36\times\sqrt 2=6\sqrt 2$
We know that $\sqrt 36=6$, because $6^{2}=36$.

Published by
Pearson

ISBN 10:
0321969359

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

$6\sqrt 2$

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