4) Se a = 7, b = - 3 e c = 2, a equação do 2º grau que corresponde a esses coeficientes é: 2x (x+1) + 5x² - 5x = - 2 2x² + 7x - 5 = 0 3x² - 7 = 0 4 (x² + 7) - 3x - 7 = 0 Nenhuma das alternativas acima.
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