EsPCEx

EsPCEx Concurso de Admissão (Escola Preparatória de Cadetes do Exército, Brazil)

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Let f: ℝ − {2} → ℝ − {3} be the bijective function defined by f(x) = (3x + 1)/(x − 2). What are the rule of its inverse function f⁻¹(x) and the value of f⁻¹(5), respectively?

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