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