Answer
See below.
Work Step by Step
We solve $x-2\sqrt x-8=0$ by letting $u=\sqrt x$. Then our equation becomes $u^2-2u-8=0.$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 8 - Section 8.4 - Equations Quadratic in Form - Concept and Vocabulary Check - Page 635: 2
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