Answer
$5\sqrt 10$
Work Step by Step
Reduce the radicals by looking for perfect-square factors inside each of the radicals.
$\sqrt 40$ + $\sqrt90$ =
$\sqrt 4 * 10 + \sqrt 9 * 10$
$2\sqrt10$ + $3\sqrt10$ =
$5\sqrt10$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 10 - Radical Expressions and Equations - 10-3 Operations with Radial Expressions - Practice and Problem-Solving Exercises - Page 617: 47
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