Answer
$2\sqrt 5$
Work Step by Step
$\sqrt 20=\sqrt (4\times5)=\sqrt 4 \times\sqrt 5=2\sqrt 5$
We know that $\sqrt 4=2$, because $2^{2}=4$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.3 - Simplifying Radical Expressions - Exercise Set - Page 433: 38
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