4x²-5x+3y²,8x²+7xy-6y²,-2x²-9xy+13y²
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Answer: 10x²-7xy+10y². Step -by-step explanation: =>4x²+8x²-2x²=10x². =>- 5xy+7xy-9xy=-7xy. =>3y²-6y²+13y²=10y²
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