Answer
$x=81$
Work Step by Step
$\sqrt x-9=0$
Add 9 to both sides.
$\sqrt x-9+9=0+9$
Simplify.
$\sqrt x=9$
Square both sides.
$(\sqrt x)^2=9^2$
Simplify.
$x=81$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 8 - Section 8.5 - Radical Equations - Exercise Set - Page 607: 4
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