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Rumus :
=
Langkah :
(2, -1) dan (0, 3)
=
4 (x - 2) = -2 (y + 1)
4x - 8 = -2y - 2
2y + 4x - 6 = 0
titik (p,q) : 0,3
rumus : y= a(x-p)pangkat2 + q
-1= a(2-0)pangkat2 + 3
-1= a(2)pangkat2 + 3
-1=a(4)+3
-1-3=4a
-4=4a
a=-4/4
a=-1
y=a(x-p)pangkat2 + q
y= -1(x-0)pangkat2 + 3
y=-1(xpangkat2) + 3
y= -xpangkat2 + 3