And so if that is the case, so if we get, so we have two minus two x plus y. So this is going to be, this right over here is going to be greater than zero. And negative two times a negative value, well this is also going to be greater than zero. 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.