Question

Evaluate the expression:

v ⋅ w

Given the vectors:

r = <5, -5, -2>; v = <2, -8, -8>; w = <-2, 6, -5>

Answer 1

to find the dot product, you multiply the corresponding components

then you add up the products

Answer 2

so should i use the vector products formula. the one with i j and k? @jim_thompson5910

Answer 3

not sure what you mean

Answer 4

but if you have

u = <a, b, c>
v = <d, e, f>

then

u dot v = a*d + b*e + c*f

Answer 5

ok. then what is the point of them giving me r?

Answer 6

@jim_thompson5910

Answer 7

either extra useless info to throw you off and confuse you

or

it's used in another problem somewhere

Answer 8

ok. i think its just irrelevent information bc it is only asking for v * w @jim_thompson5910

Answer 9

yes it's irrelevant here, but another problem probably uses these 3 same vectors

Answer 10

ok. thank you so much!!!!! @jim_thompson5910

Answer 11

np