Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 2 - Functions, Equations, and Graphs - 2-1 Relations and Functions - Practice and Problem-Solving Exercises - Page 66: 35



Work Step by Step

If $f(x)=3x-21$ and $g(x)=3x+21$, then we can get $f(x)-g(x)=(3x-21)-(3x+21)$ by substituting. From $(3x-21)-(3x+21)$, we can distribute -1 to the terms in the second set of parentheses. That gives $3x-21-3x-21=-42$.
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