00:02
Here, we're told that f of x is equal to x minus 3 to the negative 2.
00:08
And we want to find all values c such that f of 4 minus f of 1 over f prime equals f prime of c times 4 minus 1.
00:16
That's essentially saying for the mean value theorem, what's the value of c? so let's find the derivative.
00:25
F prime of x is equal to negative 2 times x minus 3.
00:33
To the negative 1.
00:36
We also need to find f of the endpoints.
00:40
So f of 1 and f of 4.
00:45
If i plug in 1, i get negative 2 to the negative 2, which is 1 4th.
00:52
If i plug in 4, i get 4 minus 3 is 1 to the negative 2 is 1.
00:59
So now i need to find the slope between these two points.
01:04
So that's change in y, 1 minus 1 4th, over change in x, 4 minus 1.
01:12
So 1 minus 1 fourth is 3 4ths over 3.
01:19
Well, that's actually just 1 4th...