Answer
$m=0$ or $m=9$.
Work Step by Step
By factorization, we have
$$m^2 -9m=m(m-9) =0.$$
Then we have
$$m =0, \quad \text{or} \quad m-9=0$$
that is $m=0$ or $m=9$.
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: 17
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