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2 x^2 - 4 x - 6 = 0
Si las raíces son x1 y x2, sus propiedades son:
x1 + x2 = - b/a; x1 , x2 = c/a; buscamos las raíces:
x1 = 3; x2 = - 1
Por lo tanto: 3 - 1 = 2 = - 4 / 2; 3 . (- 1) = - 3 = - 6 / 2
Saludos Herminio