Answer
$x^{3}y^{3}(x^{6}y^{3}+y^{2}-x+1)$
Work Step by Step
$x^{9}y^{6}+x^{3}y^{5}-x^{4}y^{3}+x^{3}y^{3}$
Take out common factor $x^{3}y^{3}$:
$x^{9}y^{6}+x^{3}y^{5}-x^{4}y^{3}+x^{3}y^{3}=x^{3}y^{3}(x^{6}y^{3}+y^{2}-x+1)$
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