So this is the open interval between negative one and one. And let's try a value there. Let's just try zero will be easy to compute. 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.