Question

Part II: Identify the domain and range of the following relations. Then determine if the relation is a function or not.

Answer 1

The first relation (10) is a function. Its domain is:

$\lbrack-4,\infty)$

And its range is:

$\lbrack-2,\infty)$

The second relation (11) is not a function. Its domain is the number -2 and its range are all the real numbers.

The third relation is a function. Its domain is:

$(-\infty,\infty)$

Its range is the number 2.