What is our volume when x is equal to 10? Well, if x equaled 10, then the width here that I've drawn in pink would be zero. So once again, we would have no volume. And this term right over here, if we just look at it algebraically, would also be equal to zero, so this whole thing would be equal to zero. So someplace in between x equals zero and x equals 10, we should achieve our maximum volume. And before we do it analytically with a bit of calculus, let's do it graphically. So I'll get my handy TI-85 out.