The domain of a function is the set (in this case of real number) on which theOriginally Posted by batman123
function is defined.
is defined whenever , which is equivalent to . Thus the
domain of is the set of all real numbers .
The range of a function is the set (in this case of real numbers)of values
which can be a value taken by the function for sone in its domain.
In this case any can be written as for
some , so the range of is the set of all .