Answer
$$(x-3-2y)(x-3+2y)$$
Work Step by Step
We have $$x^2-6x+9-4y^2$$
Factorizing $$(x-3)(x-3) - 4y^2$$ $$(x-3)^2 -4y^2$$ $$(x-3-2y)(x-3+2y)$$
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