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p=2
q=6
f(x)=a(x-p)²+q
f(x)=a(x-2)²+6
f(4)=a(4-2)²+6=0
4a+6=0
4a=-6
a= -3/2
f(x)=-3/2(x²-4x+4)+6 = -3/2x²+6x-6+6
f(x)=-3/2x²+6x