Answer
$ x=7 $ or $x=-7$.
Work Step by Step
By factorization, we have
$$x^2-49=(x+7)x-7)=0.$$
Then we have
$$(x-7 ) =0, \quad \text{or} \quad (x+7)=0$$
that is $ x=7 $ 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 - Section 11.1 - Solving Quadratic Equations by Factoring - Exercise - Page 364: 9
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