Let me do it in a new color. It's going to be negative when x is larger than 3 because this is going to be larger than 81. If this is negative and this is positive, then the whole thing is going to be negative because this denominator is still going to be positive. Then f prime prime is going to be less than 0. We're going to be concave downwards. One last one. What happens when x is just greater than minus 3?