Question
Factor by grouping to obtain the difference of two squares.$$z^{2}-x^{2}+4 x y-4 y^{2}$$
Step 1
We can group the terms containing $z$ and $x$ together and the terms containing $y$ together. So, the expression becomes: $$ z^{2}-x^{2}+4 x y-4 y^{2} = (z^{2}-x^{2}) + (4xy - 4y^{2}) $$ Show more…
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