#### Answer

$9\sqrt{10x}$

#### Work Step by Step

RECALL:
For any real numbers $a, b,$ and $c$,
$ac+bc=(a+b)c$
Use the rule above to combine like terms:
$=(7+2)\sqrt{10x}
\\=9\sqrt{10x}$

Published by
Pearson

ISBN 10:
0-13417-805-X

ISBN 13:
978-0-13417-805-9

$9\sqrt{10x}$

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