Algebra: A Combined Approach (4th Edition)

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

Chapter 6 - Test: 21

Answer

$ x= 1 , -7$

Work Step by Step

$x(x+6) = 7$ $x^2 + 6x = 7$ $x^2 + 6x - 7 = 7 - 7$ $x^2 + 6x - 7 = 0$ $x^2 - x + 7x - 7 = 0$ $x ( x - 1) + 7( x- 1)= 0$ $(x-1) ( x + 7) = 0$ Therefore $x-1 = 0$ $x = 1$ OR $x+7 = 0$ $ x= -7$
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