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sumbu simetri di x= 0, titik minimum (0,-16)
x1 = -4 dan x2 = 4
b. y = x² - 2x - 15
y = (x-5)(x+3)
sumbu simetri di x= 1, titik minimum di (1,-16)
x1 = -3 dan x2 = 5
gambar di lampiran