Answer
$x=-\frac{8}{3}$ or $x=-4$.
Work Step by Step
By factorization, we have
$$3x^2 +20x+32=(3x+8)(x+4)=0.$$
Then we have
$$(3x+8) =0, \quad \text{or} \quad (x+4)=0$$
that is $x=-\frac{8}{3}$ or $x=-4$.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 11 - Review - Page 380: 9
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