# Chapter 3 - Review Exercises: 25

$-5$

#### Work Step by Step

RECALL: A function's average rate of change from $x=a$ to $x=b$ is given by the formula: $\text{average rate of change} = \dfrac{f(b)-f(a)}{b-a}$ Use the formula above to obtain: $\text{average rate of change} \\= \dfrac{f(3)-f(2)}{3-2} \\=\dfrac{(2-5\cdot 3)-(2-5 \cdot 2)}{1} \\=\dfrac{(2-15)-(2-10)}{1} \\=\dfrac{-13-(-8)}{1} \\=\dfrac{-13+8}{1} \\=\dfrac{-5}{1} \\=-5$ Thus, the average rate of change of the given function from $x=2$ to $x=3$ is $-5$.

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