Question

What is the dot product of `<9,4,1>` and `<-5,1,7 >`?

Answer 1

`A.B=-34`

Explanation:

`A=( A_i , A_j ,A_k)`
`B=(B_i ,B_j ,B_k)`
`A.B=(A_i.B_i + A_j.B_j +A_k.B_k)`
`A.B=(-5.9 +4.1 +1.7)`
`A.B=-45 + 4 +7`
`A.B=-34`