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= 11x²+22xy+22y²-4x²+8
= 11x²-4x²+22y²+22xy+8
= 7x²+22y²+22xy+8
=11x2+22xy+22y2-4x2-8
=11x2-4x2+22xy+22y2-8
=7x2+22xy+22y2-8 11