Answer
$$(x-\sqrt {3})(x+\sqrt {3})(y+4)$$
Work Step by Step
We have $$x^2y+4x^2-3y-12$$
Factorizing $$x^2(y+4)-3(y+4)$$ $$(x^2-3)(y+4)$$ $$(x-\sqrt {3})(x+\sqrt {3})(y+4)$$
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