Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 9 - Basic Algebra - Review Exercises - Page 696: 48



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 $a$).
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