Answer
$x=9$ or $x=-1$
Work Step by Step
We solve:
$x^{2}-8x-9=0$
We factor using the formula $(a+b)(c+d)=ac+ad+bc+bd$:
$(x-9)(x+1)=0$
$x-9=0$ or $x+1=0$
$x=9$ or $x=-1$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 3 - Cumulative Review - Page 271: 3
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