Answer
18
Work Step by Step
We square both sides of the equation and solve. Thus:
$ x -2 = 1 + x+ 7- 2\sqrt{x+7} \\ -10 = -2\sqrt{x+7} \\ 5 = \sqrt{x+7} \\ 25 = x+7 \\ x=18 $
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 9 - Roots and Radicals - 9.5 - Solving Radical Equations - Problem Set 9.5 - Page 425: 47
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