And instead of saying we're going between 0 and 2, let's just say we're going between a and b. So these are just two endpoints along the x-axis. So how would we find the volume of this? Well, just like the last video, we would still take a disk just like this, but what is the height of the disk now? Well, the height of the disk is not just x squared, we've generalized it. It is going to be whatever the value of our function is at that point. So the height of the disk is going to be f of x.