Evaluate
430x^{2}-255xy-204y^{2}
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430x^{2}-255xy-204y^{2}
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441x^{2}-273xy-210y^{2}+18xy+6y^{2}-11x^{2}
Use the distributive property to multiply 21 by 21x^{2}-13xy-10y^{2}.
441x^{2}-255xy-210y^{2}+6y^{2}-11x^{2}
Combine -273xy and 18xy to get -255xy.
441x^{2}-255xy-204y^{2}-11x^{2}
Combine -210y^{2} and 6y^{2} to get -204y^{2}.
430x^{2}-255xy-204y^{2}
Combine 441x^{2} and -11x^{2} to get 430x^{2}.
441x^{2}-273xy-210y^{2}+18xy+6y^{2}-11x^{2}
Use the distributive property to multiply 21 by 21x^{2}-13xy-10y^{2}.
441x^{2}-255xy-210y^{2}+6y^{2}-11x^{2}
Combine -273xy and 18xy to get -255xy.
441x^{2}-255xy-204y^{2}-11x^{2}
Combine -210y^{2} and 6y^{2} to get -204y^{2}.
430x^{2}-255xy-204y^{2}
Combine 441x^{2} and -11x^{2} to get 430x^{2}.
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