What should be added to the sum of x^ 2 +y^ 2 +xy and4x^ 2 +4xy to get 2x ^ 2 + 3xy ?
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Answer:
The answer is x+1 =y+8
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7abc + (- 5abc) + (9 abc) + (- 8abc)
= 7abc - 5abc + 9abc - 8abc
= (7 - 5 + 9 - 8)abc
= (16 - 13)abc
= 3abc
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