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Verified answer
Dik puncak (xp,yp)=(2,-3)dan titik yg dilalui: (x,y)=(1,-2)
persamaan parabolanya:
y=a(x-xp)²+yp
-2=a(1-2)²+(-3)
1=a(-1)²
a=1
sehingga fungsi kuadratnya:
y=1(x-2)²-3
y=x²-4x+4-3
y=x²-4x+1