#### Answer

$3\sqrt 2$

#### Work Step by Step

$\sqrt 18=\sqrt (9\times2)=\sqrt 9\times\sqrt 2=3\sqrt 2$
We know that $\sqrt 9=3$, because $3^{2}=9$.

Published by
Pearson

ISBN 10:
0321969359

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

$3\sqrt 2$

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