Question

Evaluate the expression:
v ⋅ w
Given the vectors:
r = <5, -5, -2>; v = <2, -8, -8>; w = <-2, 6, -5>

Answer 1

multiply first components
multiply second components
multiply third components
---
add those products to find the dot product

Answer 2

so i multiple all three together? even the r?

Answer 3

v dot w
the first components of both v and w are 2 and -2 respectively

Answer 4

the second components of both v and w are -8 and 6 respectively

Answer 5

the third components of both v and w are -8 and -5 respectively

Answer 6

so do i just ignore the r? thats what im asking. i know how to do v dot w but they also gave me the vector of r

Answer 7

you have v dot w
where is r? why do you want to include it?

Answer 8

i dont know. they just gave it to me in the equation and it confused me.

Answer 9

I don't see it in v dot w
I just v and w

Answer 10

v dot w means you use v and w

Answer 11

there is no r in "v dot w"
so you don't use r

Answer 12

are you able to finish the problem now?

Answer 13

did you add the products I mentioned above:
2(-2)+(-8)(6)+(-8)(-5)?

Answer 14

yeah i did. i got -92

Answer 15

-4-48+40
should give you something else