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X1 = [-4 + 8]/[2] = 2
X2 = [-4 - 8]/[2] = -6
Los valores de X que hacen 0 a la expresion son X = 2 y X = -6
Factorizando ese trinomio nos queda:
x²+4x-12 = (x+6)(x-2)
Luego:
x+6 = 0
x = -6
x-2 = 0
x = 2
Valores;
X1 = -6
X2 = 2