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4z² + 8 = 12
4z² = 12 - 8
4z² = 4
z² = 4/4
z² = 1
z = √1 Tiene 2 soluciones reales.
z = 1 Porque (1)(1) = 1
o
z = - √1
z = - 1 Porque ( - 1)( - 1) = 1
Solucion.
(1 , - 1)