[tex]X^3+PX+Q=0[/tex](adsbygoogle = window.adsbygoogle || []).push({});

[tex]X_0 = A + B [/tex]

[tex](A+B)^3 + P(A+B) + Q = 0[/tex]

[tex]A^3 + B^3 + (3AB+P)(A+B) + Q = 0[/tex]

The next step is 3AB+P=0

What make Cardano drop 3AB+P?

Why it is zero?

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# Cardan's cubic equation

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