Mathematics for IGCSE & O level - Functions (Section 1 - No. 25) | ExamPlay

Mathematics for IGCSE & O level - Functions (Section 1 - No. 25)

If f(x) = 3x - 5, then what is f^-1(7)?

2/3

4

16/3

26

Explanation

First find f^-1(x). Swap x and y, then y = (x+5)/3. f^-1(7) = (7+5)/3 = 4

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