Answer
$2$
Work Step by Step
Step 1. Given $f(x)=2x+9$, we have $f(x+h)=2(x+h)+9=2x+2h+9$
Step 2. $f(x+h)-f(x)=2(x+h)+9=2x+2h+9-2x-9=2h$
Step 3. Thus $\frac{f(x+h)-f(x)}{h}=2$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 2 - Graphs and Functions - Chapter 2 Test Prep - Review Exercises - Page 299: 111
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