Answer
$x=-6, -7$
Work Step by Step
$x^2+13x=-42$
$x^2+13x+42=-42+42$
$x^2+13x+42 = 0$
$(x+6)(x+7)=0$
$x+6=0$
$x+6-6=0-6$
$x=-6$
$x+7=0$
$x+7-7=0-7$
$x=-7$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-4 Factoring to Solve Quadratic Equations - Practice and Problem-Solving Exercises - Page 558: 20
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