This does not mean that there is no algebraic solution to the
general polynomial equations of degree five and above [2]. In fact these equations
are solved algebraically by employing symbolic coefficients: the general quintic is
solved by using the Bring radicals, while the general sextic can be solved in terms
of Kampe de Feriet functions [3].
In this paper, we describe a method to decompose the given sextic equation
(sixth-degree polynomial equation) into two cubic polynomials as factors. The
cubic polynomials are then equated to zero and solved to obtain the six roots of the
sextic equation in radicals. The salient feature of the sextic solved in this manner is
that, the sum of its three roots is equal to the sum of its remaining three roots. The
condition required to be satisfied by the coefficients of such solvable sextic is derived.
A numerical example is solved in the last section using the method presented.