So it's pretty clear that a is equal to 5 and that f of a is equal to 125. Now, what about f of x? Well, here, it's the limit of f of x minus f of a. Well, here's the limit as x to the third minus 125. And this makes sense. If f of x is equal to x to the third, then it makes sense that f of 5 is going to be 5 to the third is going to be 125. And we're also taking up here, the limit as x approaches a.