Answer
$$(x+6)^2(y-3)(y+1)$$
Work Step by Step
We have $$y^2(x+6)^2-2y(x+6)^2-3(x+6)^2$$
Factorizing $$(x+6)^2(y^2-2y-3)$$ $$(x+6)^2(y-3)(y+1)$$
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