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INGAT, gunakan titik yg x nya 0 terlebih dahulu
**(0,6) --> 6 = a.0^2 + b.0 + c <--> 6 = 0 + c
c = 6 ... (1)
**(-2 , 0) --> 0 = a(-2)^2 + b(-2) + 6
0 = 4a - 2b + 6 <==> 2b = 4a + 6
b = 2a + 3 ... (2)
**(6 , 0) --> 0 = a(6^2) + b(6) + 6
0 = 36a + 6b + 6 <==> 0 = 6a + b + 1
Masukkan nilai b di (2)
6a + (2a+3) + 1 = 0
6a + 2a + 3 + 1 = 0
8a + 4 = 0
a = -4/8 = -(1/2) ... (3)
Masukkan nilai a ke (2)
b = -(1/2) a + 3 = -(1/2)2 + 3 = -1 + 3 = 2
Diperoleh a = -(1/2), b = 2, c = 6. Maka persamaan tersebut adalah
y = -(1/2)x^2 + 2x + 6