Stability of a mixed type quadratic, cubic and quartic functional equation
classification
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keywords
equationfunctionalstabilitycubicgeneralgeneralizedhyers-ulammixed
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In this paper, we obtain the general solution and the generalized Hyers-Ulam Rassias stability of the functional equation $$3(f(x+2y)+f(x-2y))=12(f(x+y)+f(x-y))+4f(3y)-18f(2y)+36f(y)-18f(x).$$
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