Find the average rate of change of the function f over the given interval.
f(x) = 0.25x4 - x2 - 5x + 5 from x = - 9 to x = 5

Question

anonymous · Answer

the average change in f can be found by [f(5) - f(-9)] / (5-(-9))

anonymous · Answer

i'm getting -115.23, but its not right and i'm not sure what i'm doing wrong.

anonymous · Answer

Find The Derivative:
-5-2 x+x^3
Solve For x = 5
-5-2*5+5^3=110       [1]
Solve For x = -9
-5-2*-9-9^3=-716    [2]
[1]-[2]=
110--716=826
I think that should work
its the Definite Derivative :)

anonymous · Answer

it didnt work.  :(

anonymous · Answer

LOL sorry yes i made a mistake 
Find The Derivative:
-5-2 x+x^3
This represents the instantaneous rate of change for any value of x
But you need to do is calculate the gradient of the line between the tow points

anonymous · Answer

http://home.windstream.net/okrebs/page201.html This Should Help