Factorise x^2+2xy +y^2-a^2+ 2ab -b^2

1.	Factorise x^2+2xy +y^2-a^2+ 2ab -b^2
Answer» X^2 +2xy +y^2 -a^2+2ab+b^2 (X+y)^2 - (a-b)^2 Then a^2-b^2 identity (x+y + a-b)(x+y -a+b) i dont know

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