Answer
$u=9$ or $u=-1$.
Work Step by Step
$u^2-8u-9=u^2+u-9u-9=u(u+1)-9(u+1)=(u+1)(u-9)$
Thus $u=9$ or $u=-1$.
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 8.3 - Quadratic Functions and Their Graphs - Exercise Set - Page 629: 99
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