Problem 4.4. consider the real function f(r) = r2 - 1. calculate each of the following. (1) the image/value of 5 under f. (2) all the pre-images of 15 under f, if they exist. (3) all the arguments associated with the value 20, if they exist. (4) all the pre-images of -10 under f, if they exist. hint. this is straight forward. just be careful with the terminologies. c..d.. th falloninga olaim ae wall ae tha "nronf