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Mathematics for IGCSE & O level - Functions (Section 2 - No. 9)

If f(x) = 2x - 4, then f^-1(x) = ?
(x+4)/2
-(2x-4)
(x-4)/2
2x+4

Paskaidrojums

x=2y-4; x+4=2y; y=(x+4)/2

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