x^2 - y^2 - 4x - 2y + 3.factorize
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Answer:
x2 -y2 +6y -9 = x2 - (y2 - 6y + 9)
= x2 - (y2 - 3y - 3y + 9)
= x2 - (y (y - 3) - 3 (y-3))
= x2 - (y - 3)(y-3)
= x2 - (y - 3)3
= (x + y -3) (x - y +3) [Using identity, a2-b2=(a+b)(a-b)]