what should be subtracted from 16x^2+4xy to get 2xy-5x^2+4?
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16x^2+4xy - (2xy-5x^2+4) = 16x^2+4xy - 2xy+5x^2-4 = 21x^2 + 2xy - 4
The answer is 21x^2 + 2xy - 4
The answer is 21x^2 + 2xy - 4
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so the answer is that i dont know
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