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b² - 4 a c = 0; (- k)² - 4 . 2 . k = 0
k² - 8 k = 0; implica k = 8 (descartamos k = 0)
La ecuación es 2 x² - 8 x + 8 = 0; que es equivalente a:
x² - 4 x + 4 = (x - 2)² = 0
Saludos Herminio