This analysis derives the general solution and explores the Hyers-Ulam stability of the functional equation.
In this paper, we derive the general solution of a quadratic-cubic functional equation 3?(x + 3y)-3?(x-3y) + 36?(2y) = 9?(x + y)-9?(x-y) + 16?(3y) and investigate the Hyers-Ulam stability of the equation.
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Chutia et al. (2025) studied this question.
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