We have to think about the bounds of region S. We know that the upper bound of region S, x is equal to, we know x is equal to two here, but we don't know this value right over here. We don't know, let's just call that a. I'll put a question mark over there. We don't know what this x value is, but we do know that at that x value, the functions are going to be equal to each other. So we know that f of a is going to be equal to g of a, or another way, in the last section, we talked about the absolute value of f of x minus g of x, which we've already inputted into our calculator and saved it. We could also say that the absolute value of f of a minus g of a is equal to zero. And you don't need the absolute value there, because obviously the absolute value of zero is going to be zero, but we've already inputted this into our calculator, so it's going to be useful. So we can solve that thing we inputted into our calculator.