#### Answer

$5\sqrt 10$

#### Work Step by Step

Applying the rules of radicals:
$\sqrt 40 + \sqrt 90$
$=2\sqrt 10+3\sqrt 10$
$=5\sqrt 10$

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Published by
Prentice Hall

ISBN 10:
0133281140

ISBN 13:
978-0-13328-114-9

$5\sqrt 10$

Applying the rules of radicals:
$\sqrt 40 + \sqrt 90$
$=2\sqrt 10+3\sqrt 10$
$=5\sqrt 10$

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