Let's try g prime prime of two, because that's in the interval. And g prime prime of two is going to be the same thing as g prime prime of negative two, because whether you have a negative two or a positive two, you square, it becomes four. So you're going to have four times negative 12, which is negative 48, plus 12, which is negative 36. Which is negative 36. And so once again on this interval you are concave, concave downward. Now let's, I graphed this ahead of time. Let's see if what we just established is actually consistent with what the graph actually looks like.