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a = 1, b = -2, c = 15
karena a > 0, grafik terbuka ke atas
tipot sumbu x ===> y = 0
y = x² - 2x - 15
0 = x² - 2x - 15
0 = (x + 3)(x - 5)
x + 3 = 0 v x - 5 = 0
x = -3 v x = 5
tipot sumbu x (-3, 0) dan (5, 0)
a