SOLUTION: please help with answer and pls show step by step on how you got the answer.
- x2 - y2 - 2xy
directions are 
Factor completely. If a polynomial is prime, state this.
Algebra.Com
Question 326551:  please help with answer and pls show step by step on how you got the answer.
- x2 - y2 - 2xy
directions are 
Factor completely. If a polynomial is prime, state this. 
Answer by user_dude2008(1862)   (Show Source): You can put this solution on YOUR website!
 -x^2-y^2-2xy = -(x^2+2xy+y^2) = -(x+y)^2
Answer: -x^2-y^2-2xy = -(x+y)^2 
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