Answer
Multiplication by $-1$.
Work Step by Step
The $-$ before $(a-b)$ is shown as equivalent to being multiplied by $-1$.
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 1 - Expressions, Equations, and Inequalities - 1-3 Algebraic Expressions - Practice and Problem-Solving Exercises - Page 24: 60
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