Mathematics for IGCSE & O level - Functions (Section 1 - No. 6) | ExamPlay

Mathematics for IGCSE & O level - Functions (Section 1 - No. 6)

If f(x) = 3x+4, find f^-1(x).

(x-4)/3

(x+4)/3

3x-4

4-3x

Explication

Swap x and y: x = 3y + 4. Then solve for y: y = (x-4)/3

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