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If R, is the set of all non - negative r...

If R, is the set of all non - negative real numbers prove that the function `f:R_(+) to [-5, infty]" defined by "f(x)=9x^(2)+6x-5` is invertible. Write also `f^(-1)(x)`.

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The correct Answer is:
`f^(-1)x=(sqrt(x+6)-1)/3forall x e in R_(f) = [-5, infty)`
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