Answer
100
Work Step by Step
$S = 2*\sqrt I -9$
$11 = 2*\sqrt I -9$
$11+9 = 2*\sqrt I -9+9$
$20 = 2*\sqrt I$
$20/2 = 2*\sqrt I/2$
$10 = \sqrt I$
$10^2 = (\sqrt I)^2$
$100 = I$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.6 - Radical Equations and Problem Solving - Exercise Set - Page 731: 67
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