Question

Find unit vector of A=2î+j-4k

Answer 1

A= 2î+j-4k
|A|= root 21

There fore unit vector
Â= A/|A|
= 2î+j-4k/ root 21

Answer 2

A = 2i + j - 4k

Unit vector = 2i + j - 4k/ √(2)^2 + (1)^2 + (-4)^2

= 2i + j - 4k/√21

Hope This Helps You!