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Verified answer
Y-yp=k (x-xp)²dengan (xp,yp) koordinat puncak
y-1=k(x-3)²
substitusi titik lain yg diketahui untuk menentukan k
(1,0)
0-1= k (1-3)²
-1=k(-2)²
-1=4k
k=-1/4
kembalikan ke persamaan
y-1=1/4(x-3)²
y-1=1/4 (ײ-6x+9)
y-1=1/4 x²-3/2x+9/4
y=1/4 x²-3/2 x +9/4+1
y=1/4 x²-3/2 x +13/4