Exercise 3: Let: ax + b f(x) = cx + d' (a) Under what conditions on a,b, c, d e R is ƒ injective? find f-1. case, (b) In this Hint: Despite the fact it does not make logical sense, it is easier to do (b) first. I guess you should try to solve for the inverse, and then note what assumptions you make along the way.

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