Right over there, let me do it in a darker color. Now let's do this next one. The limit of f of x as x approaches four. So as we approach four from the left-hand side, what is going on? Well as we approach four from the left-hand side, it looks like our function, the value of our function, it looks like it is approaching three. Remember, you can have a limit exist at an x value where the function itself is not defined. The function, if you said what is f of four, it's not defined.