Question

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

Answer 1

you multiply the corresponding components . This is called the scalar (or dot) propduct

Answer 2

FLVS isn't clear on how to do this in the lesson. It's all over the place. Can you run me through it?

Answer 3

v . w = <2, -8, -8> . <-2, 6, -5>
= 2*2

can you continue?

Answer 4

ooops sorry
the first part is 2 *-2 + -8*6


what is the last part?

Answer 5

I'm looking back through the lesson and I can't seem to find it.. Give me a second?

Answer 6

do you see the pattern?

Answer 7

yes.

Answer 8

its not that hard

Answer 9

+-8*-5

Answer 10

right

so if you simpify you'll get the scalar product whwich is just a number , not a vector. That is why its called the scalar product.

Answer 11

i get it -4 - 48 + 40 agreed?

Answer 12

Okay.. so 2 *-2 + -8*6 + -8*-5. Yes. -4-48+40. Thankyou so much for explaining it to me!

Answer 13

yw