Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 7 - Review Exercises: 55

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 $2^{2}=4$.
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