Cubic and Quartics, solving methods?

[PrudensOptimus]

Instead of long ass "formulas" for Cubic and Quartics equations, can someone give some solving techniques? Perhaps in the end attach the formula just in case your hand gets itchy?

 

[lethe]

cubic

 

[Allegro]

Cubics and quartics

You can also use a numerical method,for instance the Newton-Raphson method, see:
http://www.sosmath.com/calculus/diff/der07/der07.html

 

[lethe]

if you don t want help, don t ask for it.

Edit: This post is a reply to an impolite comment by Prudens that has since been deleted.