The Inverse of a cubic function

Authors

  • Marilina Carena Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Químicas
  • Ricardo Toledano Universidad Nacional del Litoral. Facultad de Ingenieria Química

DOI:

https://doi.org/10.33044/revem.46291

Keywords:

Inverse function, Roots, Cubic polynomial function

Abstract

Motivated by a question asked by an undergraduate student we determine when the cubic function f(x) = x3 + ax, with a being a real number, is bijective in its domain. For this purpose we use some basic results from calculus and by using a formula for the solution of the cubic equation x3 + mx = n found by Cardano in the 16th century, we find an explicit expression for the inverse function of f

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References

Klein, F. (1913). Lectures on the icosahedron and the solution of equations of the fifth degree. Kegan Paul. London.

Spivak, M. (1998). Calculus. Cálculo infinitesimal. Ed. Reverte.

Tignol, J.-P. (2016). Galois’ theory of algebraic equations (Second ed.). World Scientific Publishing Co. Pte. Ltd., Hackensack, NJ.

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Published

2024-08-30

Issue

Section

Artículos de Matemática