So s prime prime of x is going to be equal to 2, and then we're going to have negative 3 times negative 512, so I'll just write that as plus 3 times 512, that's going to be 1536, is that right? Yeah, 3 times 500 is 1500, 3 times 12 is 36, x to the negative 4 power. So this thing is going to be, this thing right over here is actually going to be positive for any x, this thing is going to be positive for any x. x to the negative 4, even if it's a negative x value, that's going to be positive, everything else is positive, this thing is always positive. So we are always in a concave upwards situation. Concave upwards means that our graph might look something like that. Actually, I don't want to draw a little squiggle, it might look something like that, and you see the reason why the second derivative implies concave upwards, a second derivative positive means that our derivative is constantly increasing, so the derivative is constantly increasing, it's negative, less negative, even less negative, let me do that in a different color. You see it's negative, less negative, even less negative, zero, positive, more positive, so it's increasing over the entire place.