First of all, we know that the point 0,3.29, that this was a minimum. Because 0 is a critical point, the slope is 0 there. Because it's concave upwards, all around 0. So 0 is definitely not an inflection point. Then we know that the points positive 3 and minus 3 are inflection points. In order to figure out their y coordinates, we can just evaluate them. They're actually going to have the same y coordinates.