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Maka:
Melalui (-1,8)
Cukup substitusikan:
↓ ↓ ↓ ↓
y = ax² - 4x + c
puncak , x = -b/2a
2 = -b/2a
b = -4a
-4 = -4a
a = 1
titik (-1,8)
8 = a.(-1)² - 4(-1) + c
8 = a + 4 + c
4 = a + c
4 = 1 + c
c = 3