Answer
Victor should not have made $-9$ positive.
Work Step by Step
When following the same method without making the $-9$ positive, the answer is as follows:
$$ -9 -5 \\ = -14$$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 640: 72
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