Question 261456
Domain: Set of all possible inputs
Range: Set of all possible outputs


Because 'x' is considered the input, we can think of the domain as the set of all 'x' values that we can plug in. Since there are no restrictions on what to plug in (we don't have to worry about dividing by zero), the domain is the set of all real numbers.


If we graph f(x) = 2x + 4, we will find that every 'y' value will get hit at some 'x' value. So the range is also the set of all real numbers.