Question 339940
{{{(7x^2 - xy + y^2) + (-x^2 -4xy + 5y^2)}}} Start with the given expression.



{{{+(7x^2-x^2)+(-xy-4xy)+(y^2+5y^2)}}} Group like terms.



{{{6x^2-5xy+6y^2}}} Combine like terms.



So {{{(7x^2 - xy + y^2) + (-x^2 -4xy + 5y^2)=6x^2-5xy+6y^2}}}



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