Question 847107
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
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  <u> -xy</u>  
                                    -2xy
L	Last terms