Answer
$x=-4$ or $x=7$.
Work Step by Step
By factorization, we have
$$x^2 -3 x-28=(x+4)(x-7)=0.$$
Then we have
$$(x+4)=0, \quad \text{or} \quad (x-7)=0$$
that is $x=-4$ or $x=7$.
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: 6
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