If ||v|| = 8, what is ||-5v||?

Question

Please help!!!

Answer 1

We have double absolute values.  We can break this up as

 

 

|| -5v || = || -5 || * || v ||

       

             = || -5 || * 8

 

             = | 5 |  * 8

 

             = 5 * 8

 

             = 40