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By definition of inverse function,
[tex]f\left(f^{-1}(x)\right) = x[/tex]
Given that f(x) = 2x + 4, solve for the inverse of f :
[tex]f\left(f^{-1}(x)\right) = 2 f^{-1}(x) + 4 = x \implies f^{-1}(x) = \dfrac{x-4}2[/tex]
(I'm not entirely sure which answer that corresponds to from the choices provided...)