What's going on here? Well, if you input an x into our function f, what's the first thing that you do? Well, you take the square root of it. So if we start off with some x, you input it, the first thing that you do is you take the square root of it. So you are going to take the square root of the input to produce the square root of x. And then what do you do? Well, you take the square root, and then you take the natural log of that.