Question

Evaluate the expression.

r = <7, -3, -7>, v = <4, 6, -5>, w = <-5, -6, -3>

v ⋅ w

Answer 1

@jdoe0001

Answer 2

@dan815

Answer 3

dot product u just multiply the corresponding numbers in each axis and add them up

Answer 4

like <a,b,c> . <d,e,f> = ad+be+cf

Answer 5

so in your case
v . w = <4, 6, -5> . <-5, -6, -3> = 4*-6+6*-6+.... finish it

Answer 6

-5*-6?

Answer 7

im confused wouldn't be 4*-5+6*-6+-5*-3?

Answer 8

=-41

Answer 9

yes

Answer 10

good

Answer 11

can you help me with some more?

Answer 12

Find the angle between the given vectors to the nearest tenth of a degree.

u = <8, 4>, v = <9, -9>

Answer 13

this time its finding an angle

Answer 14

u.v = |u||v|cos angle

Answer 15

confused with the cos angle

Answer 16

wait is the answer 35.8degrees?

Answer 17

if so then i understand