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2(a-b)²-(a+b)²=
=2*(a²-2ab+b²)-(a²+2ab+b²)=
=2a²-4ab+2b²-a²-2ab-b²
=a²-6ab+b²
2x²-1-x-2
2x²-x-3
2(a-b)²-(a+b)²=2(a²-2ab+b²)-(a²+2ab+b²)=2a²-4ab+2b²-a²-2ab-b²=a²+b²-6ab
2(a-b)²-(a+b)²=2(a²-2ab+b²)-(a²+2ab+b²)=2a²-4ab+2b²-a²-2ab-b²=a²-6ab+b²