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Mathematics for IGCSE & O level - Functions (Section 1 - No. 5)

Given the function f(x) = 2x-7, what is the inverse function, f^-1(x) ?
(x+7)/2
(x-7)/2
2x+7
-2x+7

Explanation

x=2y-7; x+7=2y; y=(x+7)/2

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