\[\frac{3x^{2} + 11x - 42}{x^{2} - 36}\]
\[x^{2} - 36 \neq 0\]
\[x^{2} \neq 36\]
\[x \neq \pm 6.\]
\[3x^{2} + 11x - 42 = 0\]
\[D = 121 + 504 = 625\]
\[x_{1} = \frac{- 11 + 25}{6} = \frac{14}{6} = 2\frac{2}{6} = 2\frac{1}{3};\]
\[x_{2} = \frac{- 11 - 25}{6} = - 6\ (не\ подходит).\]
\[Ответ:при\ x = 2\frac{1}{3}.\]