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

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

解释

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

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