So you could take a test value, let's say one is in this interval, and let's say three is in this interval. And you could say one minus two squared is going to be, let's see, that's negative one squared, which is one. And then you're just going to, this is just going to be 12. So this is going to be positive. And if you tried three, three minus two squared is one times 12. Well, that's also going to be positive. And so you're going to be concave upwards, at least at these test values, it looks like on either side of two, that the sign of the second derivative is positive on either side of two.