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a = -2
b = -7
c = a
Definit Negatif, a < 0 dan D > 0, maka:
D > 0
b² - 4ac > 0
(-7)² - 4(-2)(a) > 0
49 - (-8)(a) > 0
49 - (-8a) > 0
49 + 8a > 0
8a > -49
a > -49/8
a < -6,125