Factorize x^2-y^2+6y-9
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Given x^2 - y^2 + 6y - 9
x^2 - (y^2 - 6y + 9)
x^2 - (y - 3)^2
(a^2 - b^2) = (a+b)(a-b).
(x - y + 3)(x+y-3).
x^2 - (y^2 - 6y + 9)
x^2 - (y - 3)^2
(a^2 - b^2) = (a+b)(a-b).
(x - y + 3)(x+y-3).
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