Question

What is `|| <1, 9, 7 > - < 4, -2, -9 >||`?

Answer 1

`|A|=sqrt 386`

Explanation:

`"step 1:"`
`"find : "<1,9,7> - <4,-2,-9>`
`<1-4,9+2,7+9>`
`<-3,11,16>`
`"step 2:"`
`"find magnitude of vector : "`
`|A|=sqrt ((-3)^2+11^2+16^2)`
`|A|=sqrt (9+121+256)`
`|A|=sqrt 386`