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D = b² - 4ac
(p - 1)x² - 4px + 5p + 6 = 0
a = p - 1
b = -4p
c = 5p + 6
b² - 4ac = 0
(-4p)² - 4(p - 1)(5p + 6) = 0
16p² - 4(5p² + p - 6) = 0
16p² - 20p² - 4p + 24 = 0
-4p² - 4p + 24 = 0
4p² + 4p - 24 = 0
p² + p - 6 = 0
(p + 3)(p - 2)
p + 3 = 0
p = -3
p - 2 = 0
p = 2
jadi p harus sama dengan -3 atau p sama dengan 2