\[\left\{ \begin{matrix} x^{2} + x - 6 < 0 \\ x \geq a\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ }\]
\[m^{2} - 3m + 2\]
\[x² + x - 6 = 0\]
\[x_{1} + x_{2} = - 1,\ \ x_{1} \cdot x_{2} = - 6\]
\[x_{1} = - 3,\ \ x_{2} = 2\]
\[при\ \ a \leq - 3 \Longrightarrow - 3 < x < 2;\]
\[при\ \ - 3 < a < 2 \Longrightarrow a \leq x < 2;\]
\[при\ \ a \geq 2 \Longrightarrow нет\ решений.\]