I should have said, we know that the slope is 0. Slope is equal to 0, and we figured that out because the first derivative was 0. This was a critical point. And we know that we're dealing with, the function is concave upwards at this point. And that tells us that this is going to be a minimum point. So what is f of, and we should actually get the coordinates so we can actually graph it. That was the whole point of this video.