Given,

The point is (2,3,4). Let this point be P.

From the figure, point E (2,0,0) is the projection of point P(2,3,4) on the x-axis.

The distance between the points P & E will give the distance of the point P from x-axis.

Distance between two points is given by

Here

a₁ =2 , b₁ =3 , c₁=4 and a₂ =2 , b₂ =0 , c₂ = 0

Distance between P and x-axis is

= √ 25

= 5

Therefore the distance between, the x-axis and the Point P (2,3,4) is 5 units.