So f of x is going to be equal to this, plus f of a. Plus f of a. So this is a general form if a is a lower bound, but they gave us some information. They said that f of one is equal to three. So if we choose a to be equal to one, if we say this is one right over here, this is one, then we know that this is going to be equal to three. So we can write f of x, f of x is equal to the integral, I'm using one as my a, since I know what f of one is, from one to x of f prime of u du plus f of one, they told us what that is, that is going to be equal to three. So this is the first part right here.