\[\frac{3c^{2} - 2c + 4}{bc^{2}} - \frac{2c + c^{2} - 9^{\backslash c}}{\text{bc}} =\]
\[= \frac{3c^{2} - 2c + 4 - 2c^{2} - c^{3} + 9c}{bc^{2}} =\]
\[= \frac{- c^{3} + c^{2} + 7c + 4}{bc^{2}}.\]