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# Let f(x)=x^2-4 what is the average rate of change of f(x) from -5 to -2. A.-7 B.1/7 C.-1/7 D.7

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Let f(x)=x^2-4 what is the average rate of change of f(x) from -5 to -2. A.-7 B.1/7 C.-1/7 D.7

Feb 6, 2019

$$\bar{\Delta} = \dfrac{f(-2)-f(-5)}{(-2) - (-5)} = \\ \dfrac{0-21}{3} = -7\\ \text{i.e. choice A}$$