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D = 0
b² - 4ac = 0
(n-1)² - 4 (1) (-n + 4) =0
n² - 2n + 1 + 4n - 16 = 0
n² + 2n - 15 = 0
(n - 3) (n + 5)
diperoleh n = 3 atau n = -5