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1 = √b² - 4ac / a
1 = √(-p)² - 4(1)(1+p) / 1
1 = √p² - 4 - 4p
kuadratkan
1 = p² - 4 - 4p
p² - 4p - 5 = 0
(p - 5)(p + 1)
p = 5 dan p = -1