Question

What is the dot product of `<9,1,-1 >` and `<6,-8,2 >`?

Answer 1

`A*B=44`

Explanation:

`A=A x+A y+A z`
`B=B x+B y+B z`
`A*B=A x*B x+A y*B y+A z*B z`
`A=9x + y-z`
`B=6x-8y+2z`
`A*B=9*6-8*1-1*2`
`A*B=54-8-2`
`A*B=54-10`
`A*B=44`