The range of a function is the set of values of the function for all possible values in the domain set. So take each of the three given values in the domain, substitute each for in the function definition and calculate each of the three possible values of the function. These three values will be your range set. By the way, you should denote both the domain and the range as sets. Your question should have been worded:
What is the range of when the domain is ? And your answer can only be correctly stated as a set of values.
John
My calculator said it, I believe it, that settles it
