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= + 4 - 3x + 6 + 1
= - 3x + 11
f(x-2)=(x-2)²-3(x-2)+1
=(x-2)(x-2)-3x-6+1
=x²-2x-2x+4-3x-6+1
=x²-2x-2x-3x+4+1
=x²-7x+5