Question

What is `|| <-7, -7, -3 > - < 4 , 4, -1 > ||`?

Answer 1

`|| <-11,-11,-2> || =sqrt 245`

Explanation:

`<-7,-7,-3> - <4,4,-1> = <-7-4,-7-4,-3-(-1)>`
`<-7,-7,-3> - <4,4,-1> = <-11,-11,-2>`
`|| <-11,-11,-2> || =sqrt((-11)^2+(-11)^2+(-2)^2)`
`|| <-11,-11,-2> || =sqrt(121+121+4)`
`|| <-11,-11,-2> || =sqrt 245`