Answer
$x=4$ or $x=-5$.
Work Step by Step
By factorization, we have
$$x^2 + x-20=(x+5)(x-4)=0.$$
Then we have
$$(x-4) =0, \quad \text{or} \quad (x+5)=0$$
That is,
$x=4$ or $x=-5$.
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: 3
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