SOLUTION: factor by grouping y^2-x^2-4x+4y show solution

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Question 1086714: factor by grouping y^2-x^2-4x+4y show solution
Found 2 solutions by Boreal, Alan3354:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
y^2-x^2-4x+4y
(y+x)(y-x)-4(x-y)
but (x-y)=-(y-x)
(y+x)(y-x)+4(y-x)
(y-x){(y+x)+4}

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Of course you show solution.
Why say that?