add: 9x2 - 11xy + 7y2, -3x2 - 5xy + 6y2
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(9×2-11xy)+7y2,(-3×2-5xy)+6y2
18-11xy+7y2,-6-5xy+6y2
18-6-11xy-5xy+7y2+6y2
12-16xy+13y2. Answer
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shyad mera answer wrong bhi ho skta hh ..... but maine try kiya
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