How to find a unit vector with the same direction as 8i - j + 4k?

Question

Allison Hurst · Accepted Answer

In the identical direction. keep the components' sign configuration (+ - +) constant. For any vector u, the unit vetor in the direction of u is

\frac{1}{| u |} u

, where

| u | = \sqrt{}

(sum of the squares of the magnitudes of the components of u).
Here. it is

\frac{1}{9} (8 i - j + 4 k)

How to find a unit vector with the same direction as 8i - j +...