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Question

Why Is this algebraic expression is different 
(x-y)² = x²-2xy+y²
 my question actually is about why x² has an (-) sign and why y² has a (+) sign 

 


Solution

Please observe carefully .both x^2 and y^2 are positive in the expansion of (x-y)^2.the product 2xy term is only negative here as the square of a difference of variables  is taken.

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