x2 + y2
x3 - y3
2x2 - 3xy + y2 - x + 1
2x3 + 2x2y - xy + 3x - y2 + 3y
x5 - y5
Correct answer is D
(x + y) is a factor 2x3 + 2x2y - xy + 3x - y^2
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