Basics, for beginners, about solving a general cubic equation,

this is for you who are in a hurry and just want´s to know what a cubic equation is
 and how to solve it. Let´s start with the general form of a cubic equation which is:

z³ + a₂z² + a₁z + a₀= 0

Define q and r as:

and let   

The roots of the cubic are then

A number of results can be derived from the above. For example:

The following relations exist between the roots;

 

 

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