Mathematics for IGCSE & O level - Functions (Section 1 - No. 31) | ExamPlay

Mathematics for IGCSE & O level - Functions (Section 1 - No. 31)

If f(x) = 3x, then f^-1(x) is:

x/3

-3x

1/3x

3/x

解释

x=3y => y=x/3

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