Answer
$x=0$ or $x=-3$.
Work Step by Step
By factorization, we have
$$3x^2+9 x=3x(x+3)=0.$$
Then we have
$$3x=0, \quad \text{or} \quad (x+3) =0$$
that is $x=0$ or $x=-3$.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 11 - Section 11.1 - Solving Quadratic Equations by Factoring - Exercise - Page 364: 29
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