# Math Help - Operation of Vector |u+v|

1. ## Operation of Vector |u+v|

Can someone show me an example of how to calculate |u+v|? I know how to do all other operations of vectors. This one seems to get me. The book is not explaining whats going on. Any help?

2. ## Re: Operation of Vector |u+v|

Originally Posted by Binary
Can someone show me an example of how to calculate |u+v|? I know how to do all other operations of vectors. This one seems to get me. The book is not explaining whats going on. Any help?
I am not quite sure what operations you mean.
But I would use $\|u+v\|=\sqrt{(u+v)\cdot(u+v)}=\sqrt{\|u\|^2+2u \cdot v+\|v\|^2}$

3. ## Re: Operation of Vector |u+v|

I figured it out in the book. THank you!