That's why this is a criteria for a maximum point. This is a criteria for a minimum point. Well, with that out of the way, can we use this intuition that we just talked about to at least try to sketch the graph of f of x? So let's try to do it. And it's just going to be a sketch. It's not going to be very exact. But at least it will give us a sense of the shape of what f of x looks like.