College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 3 - Cumulative Review: 3


$x=9$ 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 $x=-1$
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