Let f: R → R defined by f(x) = x² for all xER. Use set notations (for example, ∩, U, −) and interval notations to simplify the sets f(f-¹ [-1, 3]) and f-¹(f[-1, 3]).
Sets are simplified using set and interval notation. The solution is detailed and well presented. The response received a rating of "5" from the student who posted the question.