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. Well, when x is less than three, we fall into this case. So f of x is just going to be equal to x squared. And so this is defined and continuous for all real numbers, so we can just substitute the three in there.