Solving a cubic equation using MATLAB

How to solve a cubic equation using Matlab Eg, if I have an equation with ax^3 + bx^2 + cx + d =0

if there are another variables how can I get equations for x ?

Please help. Thanks, M

Answer 1

[Roger Stafford]

It looks as though you are interested in a symbolic rather than numeric solution. If 'solve' doesn't work, you may find the following article useful:

 http://en.wikipedia.org/wiki/Cubic_function