solve the questions of math
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according to question .
= (x^2 - 2xy + y^2) + ( 3x^2 + 4xy - y^2 ) - ( -2x^2 + 5xy + 4y^2 )
= x^2 - 2xy + y^2 + 3x^2 + 4xy - y^2 + 2x^2 - 5xy - 4y^2
= x^2 + 3x^2 + 2x^2 - 2xy + 4xy - 5xy + y^2 - y^2 - 4y^2
= 6x^2 - 3xy - 4y^2 .
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