Answer
A
Work Step by Step
The equation $x^{2}-4x-12=0$ can easily be solved by factoring as shown below:
$x^{2}-4x-12=0$
$x^{2}+2x-6x-12=0$
$x(x+2)-6(x+2)=0$
$(x+2)(x-6)=0$
$x+2=0$ and $x-6=0$
$x=-2$ and $x=6$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 10 - Quadratic Equations - 10.4 - Solving Quadratic Equations - Which Method? - Concept Quiz 10.4 - Page 457: 7
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