• The domain of a function is the complete set of possible values of the independent variable. The range of a function is the complete set of all possible resulting values of the dependent variable.

1]

The domain: x ∈ ( – ∞, + ∞)

The range: y ∈ ( – ∞, 0)

2]

The domain: x ∈ ( – ∞, + ∞)

The range: y ∈ ( – ∞, + ∞)

3]

The domain: x ∈ [0, + ∞)

The range: y ∈ [0, + ∞)

4]

The domain: x ∈ ( – ∞, 0) U (0, + ∞)

The range: y ∈ ( – ∞, 0) U (0, + ∞)