Answer
$x=-4, -5$
Work Step by Step
Solve the equation: $x^{2}+9x+20=0$
$x^{2}+5x+4x+20=0$
$x(x+5)+4(x+5)=0$
$(x+4)(x+5)=0$
Because of the Zero Product Property, $(x+4)=0$ and $(x+5)=0$ are both true.
Therefore, $x=-4, -5$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - 4.4 Solve ax(squared) + bx + c = 0 by Factoring - 4.4 Exercises - Quiz for Lessons 4-1-4.4 - Page 265: 7
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