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Calculate the average rate of change from [tex][tex]$x=-2$[/tex][/tex] to [tex][tex]$x=1$[/tex][/tex] of the function below.

[tex]f(x)=x^2+5x-12[/tex]

First, find the change in [tex]y[/tex] by evaluating the function at [tex]-2[/tex] and [tex]1[/tex]:

[tex]f(-2)=[/tex] [tex]\square[/tex]

[tex]f(1)=[/tex] [tex]\square[/tex]

The change in [tex]y[/tex] is [tex]\square[/tex]


Sagot :

To calculate the average rate of change of the function [tex]\( f(x) = x^2 + 5x - 12 \)[/tex] from [tex]\( x = -2 \)[/tex] to [tex]\( x = 1 \)[/tex], let's go through the steps:

1. First, we find the values of the function at [tex]\( x = -2 \)[/tex] and [tex]\( x = 1 \)[/tex].

- Evaluating the function at [tex]\( x = -2 \)[/tex]:
[tex]\[ f(-2) = (-2)^2 + 5(-2) - 12 = 4 - 10 - 12 = -18 \][/tex]
Therefore, [tex]\( f(-2) = -18 \)[/tex].

- Evaluating the function at [tex]\( x = 1 \)[/tex]:
[tex]\[ f(1) = 1^2 + 5(1) - 12 = 1 + 5 - 12 = -6 \][/tex]
Therefore, [tex]\( f(1) = -6 \)[/tex].

2. Next, we calculate the change in [tex]\( y \)[/tex] (i.e., the difference between the function values at these points):

[tex]\[ \Delta y = f(1) - f(-2) = -6 - (-18) = -6 + 18 = 12 \][/tex]

3. The change in [tex]\( x \)[/tex] is given by the difference in the [tex]\( x \)[/tex]-values. Here, [tex]\( x \)[/tex] changes from [tex]\( -2 \)[/tex] to [tex]\( 1 \)[/tex]:

[tex]\[ \Delta x = 1 - (-2) = 1 + 2 = 3 \][/tex]

4. Finally, we find the average rate of change by dividing the change in [tex]\( y \)[/tex] by the change in [tex]\( x \)[/tex]:

[tex]\[ \text{Average rate of change} = \frac{\Delta y}{\Delta x} = \frac{12}{3} = 4 \][/tex]

Summarizing the steps:
- [tex]\( f(-2) = -18 \)[/tex]
- [tex]\( f(1) = -6 \)[/tex]
- Change in [tex]\( y = 12 \)[/tex]
- Change in [tex]\( x = 3 \)[/tex]
- Average rate of change = 4

Therefore, the average rate of change of the function [tex]\( f(x) \)[/tex] from [tex]\( x = -2 \)[/tex] to [tex]\( x = 1 \)[/tex] is [tex]\( 4 \)[/tex].