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Let f : (0, ∞) → R be a function defined by f(x) = 9x^2 + 6x - 5. Prove that f is not invertible

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Let f : (0, ∞) → R be a function defined by f(x) = 9x2 + 6x - 5. Prove that f is not invertible Modify, only the co-domain of f to make f invertible and then find its inverse.

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f(x) =9x2 + 6x -5

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