The domain of a function or relation is the set of all possible independent values that a function can have. It is the collection of all possible entries.
Given:
x f(x)
-3 5
0 10
6 5
12 0
The domain would be the values of x, in another words:
D: {-3, 0, 6, 12}
The range of a function is the set of real values that the variable y or f (x) takes.
As you can see from the graph, the maximum value of the function is 4, and then tends to minus infinity along the -y axis.
So, the range of this function is:
R: (-∞, 4]