Subtract−2x2+5xy+4y2−2x2+5xy+4y2 from the sum of x2−2xy+y2x2−2xy+y2 and 3x2+4xy−y23x2+4xy−y2
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Answer:
2x2y + (- 4x2y) + 6x2y + (- 5x2y)
= 2x2y - 4x2y + 6x2y - 5x2y
= (2 - 4 + 6 - 5)x2y
= (8 - 9)x2y
= -x2y
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