SOLUTION: x^2-4xy+4y^2-z^2+8z-16. Factor completely. Should I group the first three? And then the second three? Help please!

Question 257120: x^2-4xy+4y^2-z^2+8z-16.
Factor completely.
Should I group the first three? And then the second three? Help please!
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
Here is the original problem:

step 1 - group the first 3 and the last 3 like this:

Notice we had to change the signs on the last 3 because we factored out a negative.
step 2 - factor the first group and the second group separately as

step 3 - notice we now have difference of 2 squares, so we factor to get

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