Question

The unit vector parallel to resultant vector a=4i+3j+6k and b=-i+3j-8k

Answer 1

let A =a+b= 3ii+6j-2k
so unit vector=3i+6j-2k/root (9+36+4)
=3i+6j-2k/7

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Answer 2

the formula for the resultant vector = a +b
then,
4i+3j+6k-I+3j-8k
=5i+6j-2k