Answer
-81
Work Step by Step
$(-1)(81)=-1\times81=-81$
In general, the product of -1 and a number $a$ will be $-a$ (which is the opposite of $a$).
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 - Review Exercises - Page 696: 48
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