That's going to be a very small number. It's going to be some positive number times 81 minus a small number, so it's going to be a positive number. When x is less than 0, or just slightly less than 0, our second derivative is positive. What happens when x is slightly larger? When I write this notation, I want to be careful. I mean really just right below 0. When x is right above 0, what happens?