Definition:Cubic Equation/Historical Note

Historical Note on Cubic Equation
The ancient Greeks solved quadratics by geometric constructions, using the points of intersection of conic sections.

The general algebraic formulation of its solution remained unknown until as late as the end of the $15$th century, at which time wrote in his  of $1494$ that the solution of the equations $x^3 + m x = n$ and $x^3 + n = m x$ were as impossible as Squaring the Circle.

However, this soon changed, as it was revealed shortly after that was able to solve both of these, as well as the type $x^3 = m x + n$.

He passed this knowledge on to his apprentice.

Despite all attempts to keep the technique secret, it leaked out, and by $1535$ also had the secret.

He was persuaded to tell, under an oath of secrecy.

However, learned that the secret had been obtained from  in the first place, so believed he was not bound by that oath, and so (to 's annoyance) published it, in is  of $1545$.