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Se puede resolver
- usando método de Cardano
- por factorización
Para determinar las raices, la función debe ser nula
x^3 + 8x^2 + 19x + 12 = 0
Factorizando
(x + 1)(x + 3)(x + 4) = 0
x + 1 = 0
x1 = - 1
x + 3 = 0
x2 = - 3
x + 4 = 0
x3 = - 4
S = {- 4, - 3, - 1}