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y = a(x-1)"+6
melalui titik (0, 4) maka :
4= a(0-1)"+6
4 = a+6
a = - 2
sehingga :
y = -2 (x-1)"+6
y = -2 (x"-2x+1)+6
y = -2x"+4x-2+6
y = -2x"+4x+4
keterangan " = maksudnya kuadrat (pangkat 2)
Jawabannya yg D