What is the dot product of $<7,1,1 >$ and $<-2,4,-8>$ ?

Question

1143 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-10-21T12:10:37

-18

$<7,1,1> * <-2,4,-8>$

$= 7(-2) + 1(4) + 1(-8)$

$= -14 + 4 - 8 = -18$

What is the dot product of <7,1,1 ><7,1,1 > and <-2,4,-8><-2,4,-8>?