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

Consider f:`R_(+)` `[4, oo]` is given by f(x)= `x^(2) + 4.` Show that f is invertible with the inverses `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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