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. Because if you put a minus 3 or positive 3 and take it to the fourth power, you're going to get the same thing. Let's figure out what they are. If we take 3 to the fourth power, that's 81.