X^2+2xy+y^2-a^2+2ab-b^2
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x^2 + 2xy + y^2 - a^2 + 2ab - b^2
=> [(x)^2 +(y)^2 +2(x)(y)] - [(a)^2 +(b)^2 -2(a)(b)]
=> [x +y]^2 - [a-b]^2
=> (x+y+a-b) (x+y - a +b)
=> [(x)^2 +(y)^2 +2(x)(y)] - [(a)^2 +(b)^2 -2(a)(b)]
=> [x +y]^2 - [a-b]^2
=> (x+y+a-b) (x+y - a +b)
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Heya!!!!!
Here is your right answer
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