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2x^2-4xy-5y^2 =2x^2-4xy+2y^2-7y^2 =2(x^2-2xy+y^2)-7y^2 =2(x-y)^2-7y^2 =[√2(x-y)-√7y][√2(x-y)+√7y] =(√2x-√2y-√7y)(√2x-√2y+√7y)
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