Remember, an inflection point is where we go from being concave upwards to concave downwards or concave downwards to concave upwards. And speaking in the language of the second derivative, it means that the second derivative changes signs as we go from below x equals two to above x equals two. But we have to test that because it's not necessarily always the case. So let's actually test it. Let's think about some intervals. Intervals. So let's think about the interval when we go from negative infinity to two.