It's in that interval. So let's take g prime prime of negative two, which is equal to negative 12 times four, because negative two squared is positive four. So it's negative 48 plus 12, so it's equal to negative 36. The important thing to realize then is well, if over here it's negative, then over this whole interval, because it's not crossing through zero or it's not discontinuous at any of these points, that's why we picked this interval, that over this whole interval, g prime prime of x is less than zero, which means that over this interval we are concave downwards. So concave, concave downward, concave downward. Now let's go to the interval between negative one and one. So this is the open interval between negative one and one.