We consider the multiquadratic functional equation. We establish its general solution and provide a characterization for this functional equation. Finally, we prove the Hyers-Ulam-Rassias stability of this functional equation.
"Solution and Stability of the Multiquadratic Functional Equation." Abstr. Appl. Anal. 2013 (SI09) 1 - 8, 2013. https://doi.org/10.1155/2013/415053