We have one critical point here at x equals zero. And then we have another critical point, I will do this at x equals four fifths. So four fifths is right around there. So that is four fifths. And let's just think about what g, what g prime is doing in these intervals. And these critical points are the only places where g prime might switch sides, switch signs. So let's first think about this, let me pick some colors I haven't used yet.