Answer
$18$
Work Step by Step
By using the slope formula, $m=\frac{f(a)-f(b)}{a-b}, a\ne b$, the average rate of change from $2$ to $4$ is:
$=\frac{f(4)-f(2)}{4-2}
\\=\frac{(3\cdot4^2-2)-(3\cdot2^2-2)}{2}
\\=\frac{46-10}{2}
\\=18$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 3 - Linear and Quadratic Functions - 3.1 Properties of Linear Functions and Linear Models - 3.1 Assess Your Understanding - Page 126: 3
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