Author(s)

Nicolas Yvain¹, Isaac Elishakoff^2*

¹SIGMA Clermont, 27 Rue Roche Genès, Aubière, France.
²Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL, USA.

In this article, analytical results are obtained apparently for the first time in the literature, for the lower and upper bounds of the roots of quadratic equations when two or all three coefficients a, b, c constitute an interval, with a method called the sign-variation analysis. The results are compared with the parametrization technique offered by Elishakoff and Miglis, and with the solution yielded by minimization and maximization commands of the Maple software. Solutions for some interval word problems are also provided to edulcorate the methodology. This article only focuses on the real roots of those quadratic equations, complex solutions being beyond this investigation.

Analytical Results, Quadratic Equations, Bounds, Sign-Variation Analysis, Interval Word Problems

Yvain, N. and Elishakoff, I. (2023) Novel Method to Deal with Interval Quadratic Equations via Sign-Variation Analysis. Journal of Applied Mathematics and Physics, 11, 3212-3250. doi: 10.4236/jamp.2023.1110208.