Consider f: R (+ to [4, oo) given by f (...

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

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