And that's what we're going to cover in this video. What you see here is a flow chart developed by the team at Khan Academy. And I'm essentially going to work through that flow chart. It looks a little bit complicated at first, but hopefully it'll make sense as we talk it through. So the goal is, hey, we want to find the limit of f of x as x approaches a. So what this is telling us to do is, well, the first thing, just try to substitute what happens when x equals a. Let's evaluate f of a.