Let f:[2,\ oo)->X be defined by f(x)=4x-...

Let `f:[2,\ oo)->X` be defined by `f(x)=4x-x^2` . Then, `f` is invertible, if `X=` `[2,\ oo)` (b) `(-oo,\ 2]` (c) `(-oo,\ 4]` (d) `[4,\ oo)`

A

`2- sqrt(4-x)`

B

`2+sqrt(4-x)`

C

`-2+ sqrt(4-x)`

D

`-2-sqrt(4-x)`

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A

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