G prime prime of zero. Well, when x is zero, this is zero, so it's just going to be equal to 12. The important thing to realize is our second derivative here is greater than zero, so we are concave upward, concave upward on this interval between negative one and one. And then finally, let's look at the interval where x is greater than one. So this is the interval from one to infinity, if we want to view it that way. And let's just try the value. Let's try g prime prime of two, because that's in the interval.