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y=3/4(x-2)²+1
=3/4(x²-4x+4)+1
=3/4x²-3x+3+1
=3/4x²-3x+4
titik puncak (2,1)
melalui (0,4)
Y=a(x-x1)²+y1
4=a(0-2)²+1
4=a(-2)²+1
4=4a+1
4-1=4a
3=4a
3/4=a (terbukti) sama
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Pilihan A.
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