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kalikan 2 kedua ruas
2y = x² - 8x - 12
2y = (x - 4)² - 16 - 12
2y = (x - 4)² - 28
(x - 4)² = 2y + 28
(x - 4)² = 2(y + 14)
4p = 2
p = 2/4 = 1/2
titik puncak parabola = (4 , -14)
titik fokus parabola = (4 , -14 + 1/2)
= (4 , -27/2)