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

If R, is the set of all non-negative real numbers prove that the `f : R, to [-5, oo)` 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) = g(y) = (sqrt(y - 6)-1)/(3)`
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