Intermediate Algebra (12th Edition)

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

Chapter R - Section R.3 - Exponents, Roots, and Order of Operations - R.3 Exercises: 43

Answer

-20

Work Step by Step

$\sqrt 400=20$, which we know because $20^{2}=20\times20=400$ Therefore, $-\sqrt 400=-(20)=-20$.
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