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Given [tex]\( f(x) = 17 - x^2 \)[/tex], what is the average rate of change in [tex]\( f(x) \)[/tex] over the interval [tex]\([1,5]\)[/tex]?

A. [tex]\(-6\)[/tex]
B. [tex]\(-\frac{1}{2}\)[/tex]
C. [tex]\(\frac{1}{4}\)[/tex]
D. 1

Sagot :

To determine the average rate of change of the function [tex]\( f(x) = 17 - x^2 \)[/tex] over the interval [tex]\([1, 5]\)[/tex], we can use the formula for the average rate of change of a function over an interval [tex]\([a, b]\)[/tex]:

[tex]\[ \text{Average Rate of Change} = \frac{f(b) - f(a)}{b - a} \][/tex]

In this case, [tex]\( a = 1 \)[/tex] and [tex]\( b = 5 \)[/tex].

Let's start by calculating the values of the function at these points:

1. Calculate [tex]\( f(1) \)[/tex]:
[tex]\[ f(1) = 17 - 1^2 = 17 - 1 = 16 \][/tex]

2. Calculate [tex]\( f(5) \)[/tex]:
[tex]\[ f(5) = 17 - 5^2 = 17 - 25 = -8 \][/tex]

Now, we can use these values to find the average rate of change:

[tex]\[ \text{Average Rate of Change} = \frac{f(5) - f(1)}{5 - 1} = \frac{-8 - 16}{5 - 1} = \frac{-24}{4} = -6 \][/tex]

Thus, the average rate of change of the function [tex]\( f(x) = 17 - x^2 \)[/tex] over the interval [tex]\([1,5]\)[/tex] is [tex]\(\boxed{-6}\)[/tex].