Test Academy | If F : R → R such that f(x) = 5x + 4 then which of the following is equal to f-1(x). (x−5)/4 , (x-y)/5, (x-4)/5, (x/4)-5

Question

If F : R → R such that f(x) = 5x + 4 then which of the following is equal to f-1(x).

Options :

(x−5)/4
(x-y)/5
(x-4)/5
(x/4)-5

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