SOLUTION: What is the coefficient of xy in the expansion of (x-y)2?

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Question 847107: What is the coefficient of xy in the expansion of (x-y)2?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

What is the coefficient of xy in the expansion of (x-y)2?  -2

 (x-y(x-y) = x^2 -2xy + y^2

F	First terms

O	Outside terms  -xy

I	Inside terms   -xy  

                                    -2xy

L	Last terms