Well the way to get g prime of x equal to zero is getting the numerator equal to zero and that's only going to happen if x squared is equal to zero or if x is equal to zero. So that's the only place where g prime of x is equal to zero. And where is g prime of x undefined? Well it's going to be undefined if the denominator becomes undefined. The denominator becomes undefined if the denominator is zero. And so that's going to happen if x minus two is equal to zero x minus two is equal to zero or x is equal to two. So we have two critical points or critical values here.