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Melalui (0,3)
Persamaan:
y = a(x-x')² + y'
Karena puncak di (1,4)
y = a(x-1)² + 4
Melalui (0,3)
3 = a(0-1)² + 4
3 = a(-1)² + 4
3 - 4 = a
a = -1
Sehingga,
y = -1(x-1)² + 4
y = -(x²-2x+1) + 4
y = -x²+2x-1+4
y = -x²+2x+3 [C]