Then this is going to be, well, if x is 3, this is 0. If x is a little bit less than 3, if it's like 2.9999, this number is going to be less than 81. This is also going to be positive. Of course, the denominator is always positive. As x is less than 3, as it's approaching from the left, we are concave upwards. This thing is going to be a positive. f prime prime is greater than 0.