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x² - x - 30 < 0
(x + 5)(x - 6) < 0
x < - 5 atau x > 6
x² - x - 30 < 0
(x - 6)(x + 5) < 0
Harga nol=
*x-6 = 0
x= 6
*x + 5 = 0
x = -5
x < -5 atau x > 6