Answer
$x=0$ should also be included.
Work Step by Step
Solving the problem correctly, we find:
$$3x\left(x+4\right)\left(x-4\right)=0 \\ x=0,\:x=-4,\:x=4$$
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 5 Polynomials and Polynomial Functions - 5.4 Factor and Solve Polynomial Equations - 5.4 Exercises - Skill Practice - Page 357: 31
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