Answer
$(x-2)(x+9)$
Work Step by Step
By finding the factors of $-18$, we have:
$-2$ and $9$ ($-3+9=7$ and $-2\times 9=-18$)
Thus:
$$
x^2+7x-18=(x-2)(x+9)
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Test - Page 358: 11
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