Answer
The error was that the sign of the constant was kept in solving the equations.
Work Step by Step
$x-4=0$
$x-4+4=0+4$
$x=4$
$x+2=0$
$x+2-2=0-2$
$x=-2$
$x=-2, 4$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.6 - Solving Quadratic Equations by Factoring - Exercise Set - Page 459: 76
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