If $P=(2,-3,4), Q=(-1,-4,0), R=(2,1,0)$ are three points and $S$ is the foot of the perpendicular drawn from…
If $P=(2,-3,4), Q=(-1,-4,0), R=(2,1,0)$ are three points and $S$ is the foot of the perpendicular drawn from $\mathrm{R}$ to $\mathrm{PQ}$, then the $\mathrm{X}$-coordinate of $\mathrm{S}$ is