# How to Find the Number of Roots by Stationary Points and Deduce for an Inverse Function Explained Quickly

The stationary points can be found by solving the derivatives to zero. Some cubic equations have one root if the stationary points are in the same sign, such as two stationary points are either above the x-axis or below the x-axis. In these cases, the cubic graph cuts the x-axis only once, so the cubic […]