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Question

What should be added to the product of (x2+xy−y2) and (x2−xy+y2) to get x2y2?

A
2x2y2x42xy3+y4
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B
2xyx3+2xy+y4
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C
2x2y2+x4+2xy3y4
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D
2x2y2+x4+2xy3+y4
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Solution

The correct option is A 2x2y2x42xy3+y4
(x2+xyy2)(x2xy+y2)=x2(x2xy+y2)+xy(x2xy+y2)y2(x2xy+y2)
=x4+2xy3x2y2y4
Let the algebraic expression to be added be A. Then
A=x2y2(x4+2xy3x2y2y4)
=x2y2x42xy3+x2y2+y4
=2x2y2x42xy3+y4

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