If the line,

If the line, $\frac{\mathrm{x}-3}{2}=\frac{\mathrm{y}+2}{-1}=\frac{\mathrm{z}+4}{3}$ lies in the plane, $\mathrm{xx}+\mathrm{my}-\mathrm{z}=9$, then $\mathrm{l}^{2}+\mathrm{m}^{2}$ is equal to :-