And if I'm adding 0.1 to it, well, I'm still going to get a negative value. So over this yellow interval, g prime of x is less than zero. And it would be, I should have gotten a calculator, or I could have gotten a calculator out. I could have just evaluated a lot easier. So g prime of x is less than zero in this interval. And let's see in this blue interval what's going on. And this will be easier.