Need some on this algebra question, anyone know the answer? would be appreciated

The domain of a function are the possible input values of the function. (i.e. the possible x-values of the function).

From the given table representing a function, the x-values of the function are -6, -1, 0 and 3.

Therefore, the domain of the function is given by {x | x = -6, -1, 0, 3}