\[x^{3}y^{2} - x^{3} - xy^{2} + x =\]
\[x^{3} \cdot \left( y^{2} - 1 \right) - x \cdot \left( y^{2} - 1 \right) =\]
\[= (y - 1)(y + 1)\left( x^{2} - 1 \right) \cdot x =\]
\[= x(y - 1)(y + 1)(x - 1)(x + 1).\]