# Math Help - [SOLVED] expression for unit vector

1. ## [SOLVED] expression for unit vector

Find an expression for the unit vector directed from point Q(x, y, 2) to point P located on the z-axis at a height h above the x-y plane.

can somebody help me how to get that answers given?
can help me step by step?
thank you...

2. Q=(x,y,2)

& P=(0,0,h)

THEREFORE,QP=-x i -y j +(h-2) k.

unit vector of QP=[-x i -y j+(h-2)k]/sqrt.(x^2+y^2+(h-2)^2)

3. Originally Posted by sbcd90
Q=(x,y,2)

& P=(0,0,h)

THEREFORE,QP=-x i -y j +(h-2) k.

unit vector of QP=[-x i -y j+(h-2)k]/sqrt.(x^2+y^2+(h-2)^2)

thx sbcd90. Appreciate ur help.