So let's think about it a little bit. So in order to be continuous, f of, let me use a darker color, f of three needs to be equal to the limit of f of x as x approaches three. Now what is f of three? Well, let's see, we fall into this case right over here, because x is equal to three. So six times three is 18, minus nine is nine, so this is nine. So the limit of f of x as x approaches three needs to be equal to nine. So let's first think about the limit as we approach from the left-hand side, the limit as x approaches three, as x approaches three from the left-hand side of f of x.