Muller’s method

This is a method for finding roots of polynomial equations of the general form:

Where n is the order of the polynomial and are constant coefficients. Continuing with the polynomials, they comply with the following rules:
•For equation of order n, there are n real or complex roots. It should be noted that these roots aren’t necessarily distinct.
•If n is odd, there is at least one real root
•If the roots are complex, there is a conjugate pair.

With the secant method by drawing a straight line crossing the three-point function,
In the muller’s method these points crossing the function but approximating to a parabola, then find the point which cuts the x-axis.