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Mathematics for IGCSE & O level - Functions (Section 1 - No. 33)

If f(x)= x/2+1, what is f^-1(x)?
2x-2
2x+2
x/2-1
x/2-2

Explanation

x=y/2+1 => x-1 = y/2 => y = 2x-2

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