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Mathematics for IGCSE & O level - Functions (Section 2 - No. 1)

If f(x) = 3x + 2, then which is f^-1(x)?
3x-2
(x-2)/3
(x+2)/3
2x+3

Selitys

x = 3y+2; x-2=3y; y=(x-2)/3

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