\[y = \frac{x^{3} - 3x^{2} + 2x - 6}{x^{2} + 2} =\]
\[= \frac{x^{2}(x - 3) + 2 \cdot (x - 3)}{x^{2} + 2} =\]
\[= \frac{(x - 3)\left( x^{2} + 2 \right)}{x^{2} + 2} = x - 3\]
\[y = x - 3 \Longrightarrow линейная\ \]
\[функция.\]