00:01
Here, we're given a function, f of x, which in this case is 2x cubed minus 4x squared.
00:09
And we're also given an interval from 0 to 1.
00:12
And we're first asked if the mean value theorem applies to this function.
00:16
Well, the mean value theorem will apply as long as the function is continuous and differentiable.
00:21
And we're given a polynomial.
00:23
So the answer is yes.
00:25
It is neither, it's continuous everywhere and it's also differentiable.
00:31
Answer is a continuous and differentiable next we want to find the point that is guaranteed to exist by the mean value theorem now the mean value theorem says that if we have a function in an interval there's going to be a place in the middle where the derivative is the same as the slope of the endpoints so let's find what is the slope at the endpoints it's going to be the change in the y over the change in x which is f of 1 minus f of 0 that's the 0 and 1 divided by 1 minus 0.
01:05
That's change in y over change in x.
01:07
So if i plug in 1 into this equation, i'm going to get 2 minus 4 is negative 2.
01:12
If i plug in 0, i get 0 minus 0 is 0.
01:16
Again, over 1 minus 0.
01:17
So it's negative 2 over 1 or just negative 2...