SOLUTION: factor completely 7x^2-7x^2y-28x+28xy

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Question 571111: factor completely
7x^2-7x^2y-28x+28xy

Answer by KMST(5328)   (Show Source): You can put this solution on YOUR website!
We can find common factors in groups of terms, and see what we end up with:

If both factors in brackets were exactly the same, we would be finding a common factor again. We can fix that, because

So

and we can write that in more elegant ways, and even factor out a

Because , it can be factored too, to get to the full factorization.

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