Stability of an ACQ-functional equation in various matrix normed spaces

Using the direct method and the fixed point method, we prove the HyersUlam stability of the following additive-cubic-quartic (ACQ ) functional equation \[11[f(x + 2y) + f(x -2y)] = 44[f(x + y) + f(x- y)] + 12f(3y)- 48f(2y) + 60f(y) - 66f(x)\] in matrix Banach spaces. Furthermore, using the fixed point method, we also prove the Hyers-Ulam stability of the above functional equation in matrix fuzzy normed spaces.