Question

Given u = (5, - 4) and v = (2, 1) find u(v)

Answer 1

A. 14
B. 10
C. 6
D. -3
E. 13

Answer 2

Are those vectors?

Answer 3

yes

Answer 4

and you want the dot product?

Answer 5

I need to find what u times v is when u is (5,4) and v is (2,1)

Answer 6

have you ever heard of the term dot product?

Answer 7

yes, i'm not quite sure how to find it though

Answer 8

You just multiply the corresponding components. Then you add those products.

Answer 9

Ex:

(2,3) dot (4,5) = 2*4 + 3*5 = 8 + 15 = 23

Answer 10

so do i just do that for (5,-4) and (2,1) and get 5*2+-4*1= 6?

Answer 11

exactly

Answer 12

Thanks so much for your help!

Answer 13

yw