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

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Answer 1 · 2016-10-21T12:10:37

-18

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

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

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

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