The reason why I'm making that constraint is that if x were to be equal to negative 2, then x plus 2 is going to be equal to 0. And you won't be able to do that. You can't. We don't know what it means to divide something by 0. So we could say that this is going to be equal to. So we can divide the numerator and the denominator by x plus 2. But we have to assume that x is not equal to negative 2.