
In this paper, we establish some hyperstability results of the following functional equationf (2x + y) + f (2x - y) = 4(f (x + y) + f (x - y)) + 24f (x) - 6f (y)in Banach spaces.
Hyperstability, fixed point theorem, Quartic functional equation
Hyperstability, fixed point theorem, Quartic functional equation
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