So there's no undefined critical points here, but we can set the numerator equal to 0 pretty easily. If we wanted to set this equal to 0, we just say 4x to the third is equal to 0, and we know what x value will make that equal to 0, x has to be equal to 0. 4 times something to the third is equal to 0, that something has to be 0. x to the third has to be 0, x has to be 0. So we can write f prime of 0 is equal to 0. So 0 is a critical point. The slope at 0 is 0, we don't know if it's a maximum or a minimum or an inflection point yet, or it could be, you know, we'll explore it a little bit more. And actually just so we get the coordinate, what's the coordinate?