What are the methods for solving a 3rd degree equation?

[chandran]

i have a 3rd degree equation as follows. how can i solve this. What are the methods available?

x^3-a*x^2+b*x+c=0

i want to find x. a,b,c are all constants

 

[Zurtex]

The solution is less than simple, but you can use the cubic equation so get it.

 

[kleinwolf]

The solution to this was already given :

https://www.physicsforums.com/showthread.php?t=71782 [/URL]

 

[DuncanM]

Mathworld has some excellent material about cubic polynomials. For example, here is a page deriving the formula for the three roots of a cubic polynomial:

http://mathworld.wolfram.com/CubicFormula.html

If you are seeking numerical solutions, rather than symbolic solutions, here is a good online solver:

http://www.akiti.ca/Quad3Deg.html