So quadrant two, because of this, that means if this whole expression is going to be positive, negative two times a negative number is going to be positive, plus a positive, plus a positive, it's going to be positive. So the second derivative, second derivative with respect to x is positive, positive, which means that our slope is increasing over that interval, which means that we have positive, we could say that we, our concavity, I always have trouble saying that. Concavity, concavity is upwards, upwards. And if you ever forget whether, okay, a second derivative being positive, is that concavity upwards or downwards, I always just like to draw kind of our, you know, the canonical concave upwards or concave downwards. And you can see here that your slope, your slope here is turning less negative, or you could say it's becoming more positive, it's increasing, and it continues to increase when you are concave upwards. So second derivative positive, you are concave upwards. Second derivative negative, you are going to be concave downwards.