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xp,yp = (1,1)
masukin ke rumus umum :
y = a(x-xp)² + yp
y = a(x-1)² + 1
untuk mencari a nya,masukkan dulu xtpnya : (2,0)
y = a(x-1)² + 1
0 = a (2-1)² +1
-1 = a
lalu masukkan kembali ke rumus awal :
y = a(x-1)² + 1
y = -1(x-1)² + 1
y = -1 (x² - 2x +1) +1
y = -x² + 2x -1 + 1
y = -x² + 2x
sehingga fungsinya nya :
f(x) = -x² + 2x