Calculating a and b in 3D Unit Vector Question for Test Prep

[Wardlaw]

I was given the question,

If u=ai+2j+4k and v=3i+bj+k, calculate a and b
in a textbook from school (revision for a test).

Any thoughts?

 

[Redbelly98]

(Moderator's note: thread moved from "General Math")

I was given the question,

If u=ai+2j+4k and v=3i+bj+k, calculate a and b
in a textbook from school (revision for a test).

It looks like more information is needed to solve the problem. What are the constraints on u and v? Do they need to be parallel, or perpendicular, or something else? If they're just arbitrary vectors, a and b could be anything.

Any thoughts?

Please give us yours first...

 

[Wardlaw]

No need! Done it.