Intermediate Algebra (12th Edition)

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

Chapter 7 - Section 7.1 - Radical Expressions and Graphs - 7.1 Exercises: 42

Answer

-.9

Work Step by Step

We know that $\sqrt .81=.9$, because $.9^{2}=.9\times.9=.81$. Therefore, $-\sqrt .81=-(.9)=-.9$.
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