# How do you find the inflection point of a cubic function?

##### 1 Answer

If

The 2nd derivative measures the concavity, down or up, and the inflection point is where that changes from negative to positive, so

If you don't know calculus, then try to find the center of symmetry; any line that meets the cubic curve in 3 equally spaced points has the inflection point as the middle.

Hope this helps; @dansmath to the rescue!