All right, so the key here is to remember that if I have f of x, let me do it over here, I'll do it over here, f of x, and I want to find f prime of, let's say f prime of some number, let's say a, this is going to be equal to the limit as x, or sorry, as h approaches zero is one way of thinking about it, as h approaches zero of f of a plus h minus f of a, all of that over h. So this looks pretty close to that limit definition, except we have these fives here. But lucky for us, we can factor out those fives, and we could factor them out out front here, but if you just have a scalar times the expression, we know from our limit properties that we can actually take those out of the limit themselves. So let's do that. Let's take both of these fives and factor them out. And so this whole thing is going to simplify to five times the limit as h approaches zero of log of two plus h minus, minus log of two, all of that over h. Minus log of two, all of that over h. Now, you might recognize what we have in yellow here. Let's think about it. What this is, if we had f of x is equal to log of x, and we wanted to know what f prime of, well actually, let's say f prime of two is, well, this would be the limit as h approaches zero of log of two plus h, two plus h, minus log of two, minus log of two, all of that over h. So this is really just a, what we see here, this by definition, this right over here is f prime of two.