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Consider f: R ^+ to [4 ,oo] given by...

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

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