And from that x value, you subtract out x is equal to negative 2. And when you subtract x is equal to negative 2, you're adding 2 here. But hopefully this makes intuitive sense. This is the x value. Let me do this in a better color. This right over here, this distance right over here, is the x value you get when you just evaluate the function of y. But then if you wanted the full radius, you have to go another 2 to go to the center of our axis of rotation.