A=2(3-x)²-(2x+1)²
=2(9-6x+x²)-(4x²+4x+1)
=18-12x+2x²-4x²-4x-1
A=-2x²-16x+17
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A=2(3-x)²-(2x+1)²
=2(9-6x+x²)-(4x²+4x+1)
=18-12x+2x²-4x²-4x-1
A=-2x²-16x+17