Abstract. A method is described to solve septic equations in radicals.
The salient feature of such a solvable septic is that the sum of its four
roots is equal to the sum of its remaining three roots. The conditions
to be satis¯ed by the coe±cients of the septic are given. A numerical
example is solved using the proposed method.
Key words and phrases. Septic equation, octic equation, seventh-degree
polynomial equation, polynomial decomposition.
2000 AMS Mathematics Subject Classi¯cation. 12D05: Polynomials
(Factorization).
Resumen. Se desribe un m¶etodo para resolver ecuaciones de grado siete
mediante radicales. La caracter¶³stica sobresaliente de estas ecuaciones
de grado siete es que la suma de de cuatro de sus ra¶³ces es igual a la
suma de las tres restantes. Se dan las condiciones que deben satisfacer
los coe¯cientes de la ecuaci¶on y se resuelve con este m¶etodo un ejemplo
num¶erico.