Question
Factor polynomial $$ x^{4}-3x^{3}y+2x^{3}+3x^{2}y^{2}-4x^{2}y+x^{2}-xy^{3}+2xy^{2}-xy-x+3y-3 $$
Answer
It seems that $ \color{blue}{ x^{4}-3x^{3}y+2x^{3}+3x^{2}y^{2}-4x^{2}y+x^{2}-xy^{3}+2xy^{2}-xy-x+3y-3 } $ cannot be factored out.
Explanation
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