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1)x^2-y^2+x-y
2)4x^2-4xy+y^2-9
3)ac^4-c^4-ac^2+c^2
4)4-m^2+2mn-n^2
1)x^2-y^2+x-y
2)4x^2-4xy+y^2-9
3)ac^4-c^4-ac^2+c^2
4)4-m^2+2mn-n^2
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Answers & Comments
2)4x^2-4xy+y^2-9=(2x-y)^2-9
3)ac^4-c^4-ac^2+c^2=ac^2(ac^2-1)+c^2(1-c^2)
4)4-m^2+2mn-n^2=4-(m^2-2mn+n^2)=4-(m-n)^2