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a^2 - 8a < 0
a (a-8) < 0
a < 8
D < 0
b^2 - 4ac < 0
a^2 - 8a < 0
a(a-8) < 0
a = 0 atau a = 8
maka pada definit negatif nilai a harus lebih kecil dari 0, maka:
a < 0