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

Oct 21, 2016

$< 7 , 1 , 1 > \cdot < - 2 , 4 , - 8 >$
$= 7 \left(- 2\right) + 1 \left(4\right) + 1 \left(- 8\right)$
$= - 14 + 4 - 8 = - 18$