And in order for this to be 0, one or both of these things must be equal to 0. So 12x squared or equal to 0, which means that x is equal to 0 will make this quantity equal to 0. And then the other thing that would make this quantity 0 is if x minus 1 is equal to 0. So x minus 1 is equal to 0 when x is equal to 1. So these are our two critical points. Our two critical points are x is equal to 0 and x is equal to 1. And remember, those are just the points where our first derivative is equal to 0.