Apply. All right, let's, I'll put an exclamation mark there for emphasis. All right, let's do the next part. Can we use the mean value theorem to say that the equation f prime of x is equal to negative one has a solution, and now the interval is from zero to two. If so, write a justification. All right, so let's see this. So if we were to take the slope of the secant line, so f of two minus f of zero, all that over two minus zero, this is equal to negative two minus zero.