Question

If avector =i+2j-3k and b=2i+4j+9kfind a unit vector parallel to a+b vector

Answer 1

Step-by-step explanation:

a=i+2j-3k

b=2i+4j+9k

a+b=3i+6j+12k

|a+b|=√(3²+6²+12²)

=√189

unit vector of a+b=a+b

|a+b|

=3i+6j+12k

√189

any vector parallel to this has same unit vector as that of unit vector of a+b