Question

Evaluate the expression.

r = <9, -7, -1>, v = <2, 2, -2>, w = <-5, -2, 6>

v ⋅ w

Answer 1

multiply "corresponding elements" and then add up the 3 products.

Answer 2

i'm just really confused tbh. can you try and explain it a little please...?

Answer 3

find the first number in v and in w, and multiply them. what do you get ?

Answer 4

-10

Answer 5

now do the "middle numbers". what do you get ?

Answer 6

-4

Answer 7

and the last ?

Answer 8

-12

Answer 9

now add up those 3 numbers

Answer 10

-26?

Answer 11

that's an answer choice! thank you so much!

Answer 12

yes -26 is the "dot product" of vector v with vector w