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p=2
q=f(2)=-2
f(x)=a(x-2)²-2
f(1)=a-2=0
a=2
f(x)=2(x-2)²-2=2(x²-4x+4)-2=2x²-8x+8-2
Odp. f(x)=2x²-8x+6.