Answer
$$ -1\pm 2i$$
Work Step by Step
The square root of -144 is 12i, not 12. Thus, the solution should be:
$$ \frac{-6 \pm 12i }{6} \\ -1\pm 2i$$
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 - 4.8 Use the Quadratic Formula and the Discriminant - 4.8 Exercises - Skill Practice - Page 297: 49
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