How to derive cubic equation?

Asked Feb 01 '18 at 14:44

Active Feb 01 '18 at 14:44

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Using completing the square method we can derive a formula $ax^2+bx+c=0$ for the quadratic equation to $$x={-b\pm \sqrt{b^2-4ac}\over 2a}$$

I am sure I haven't sees it in any book talking about deriving the cubic equation $ax^3+bx^2+cx+d=0$ using the method of completing the square or the cube.

So how did they derive the cubic formula to solve the cubic equation?

asked Feb 01 '18 at 14:44

2

You can find it in Wikipedia – Feb 01 '18 at 14:45
see here https://math.vanderbilt.edu/schectex/courses/cubic/ – Dr. Sonnhard Graubner Feb 01 '18 at 14:49
See my answer here – Ng Chung Tak Feb 01 '18 at 14:58

How to derive cubic equation?

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