Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 6 - Review - Page 474: 57


The solutions are -7 and -1.

Work Step by Step

$x^{2}$+8x+7=0 $x^{2}$+x +7x+7=0 x(x+1)+7(x+1)=0 (x+7)(x+1)=0 x+7=0 and x+1=0 x+7-7=0 -7 and x+1-1=0-1 x=-7 and x=-1 Check Let x=-7 $x^{2}$+8x+7=0 $(-7)^{2}$+8(-7)+7=0 49-56+7=0 0=0 Let x=-1 $x^{2}$+8x+7=0 $(-1)^{2}$+8(-1)+7=0 1-8+7=0 0=0
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