Question

x^2 - y ^2 - 6y -9.factorize
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Answer 1

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)]