So you can already say, well we can't go from increasing to decreasing at this critical point because we're already decreasing to the left of it. But anyway, let's just think about what's happening in the other intervals. So in the interval between zero and 4 5ths, so that interval right over there, so it's between zero and 4 5ths. Well let's just sample a number there. Let's say the number, I don't know, 1 1 2 might be really straightforward. So we can evaluate g prime of 1 1 2. G prime of 1 1 2 is equal to four times 1 1 2 to the third power.