## anonymous 4 years ago Find the average rate of change of the function f over the given interval. f(x)=0.25x^4-x^2-9x+8 from x=-4 to x=3

1. freckles

$\frac{f(-4)-f(3)}{-4-3}$ Use this to find the slope of the secant line from x=-4 to x=3

2. anonymous

I don't understand how you put that into the problem.

3. freckles

No you put the problem into that

4. freckles

Do you know how to find f(-4)?

5. anonymous

Would you put it into the equation?

6. freckles

Replace the x's in your function with -4's

7. freckles

Then to evaluate f(3) Replace the x's in your function with 3's

8. anonymous

So what I got is for f(-4)= 92 and f(3)= -7.75...is that right?

9. freckles

That is right ! :)

10. freckles

$\frac{92-(-7.75)}{-4-3}$

11. anonymous

Ooooh wow I get it now! Thank you so much!