Answer
15
Work Step by Step
Applying the rules of radicals:
$\sqrt 5.\sqrt 45$
$=\sqrt 5.(3\sqrt 5)$
$=15$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - 10-3 Operations With Radical Expressions - Practice and Problem-Solving Exercises - Page 631: 71
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