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Consider f: R+vec[4,\ oo] given by f(x)=...

Consider `f: R_+vec[4,\ oo]` given by `f(x)=x^2+4.` Show that `f` is invertible with the inverse `(f^(-1))` of `f` given by `f^(-1)\ (y)=sqrt(y-4)` , where `R_+` is the set of all non-negative real numbers.

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The correct Answer is:
`f^(-1) (x) = sqrt(x-4)`.
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