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x² - 4x + 4 = 0 factorizas trinomio al cuadrado perfecto aplicas:
a² - 2ab + b² = (a - b)²
x² - 2(x)(2) + 2² = 0
(x - 2)² = 0
(x - 2)(x - 2) = 0 Tiene 2 solucioneres reales iguales
x - 2 = 0
x = 2
Solucion.
x = 2