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melalui titik=(1,6)
f(x)=a(x-xp)²+yp
6=a(1-4)²+3
6=a(-3)²+3
6-3=9a
3/9=a
1/2=a
f(x)=1/2(x-4)²+3
f(x)=1/2(x²-8x+16)+3
f(x)=1/2x²-4x+8+3
y=1/2x²-4x+11
kalau dikali 2
y=x²-8x+22