Solve this following

Show that the lines $\frac{\mathrm{x}-3}{2}=\frac{\mathrm{y}+1}{-3}=\frac{\mathrm{z}-2}{4}$ and $\frac{\mathrm{x}+2}{2}=\frac{\mathrm{y}-4}{4}=\frac{\mathrm{z}+5}{2}$ are perpendicular to each other.