Question

WILL FAN AND MEDAL!!
Given that c= 4i + 3j – k and d= i – 2j + k, find c * d.

Answer 1

Are you looking for the dot product or the cross product?

Answer 2

dot product

Answer 3

Ok, that's easy.

Answer 4

Alright

Answer 5

Dot product = (4 * 1) + (3 * -2) + (-1 * 1)

Answer 6

4+-6+-1=-3

Answer 7

Yup! That is it!

Answer 8

but my answer choices are not in component form...there in the other form

Answer 9

I don't remember what it's called, but it has the variables

Answer 10

What are the choices?

Answer 11

i-5j-11k

Answer 12

i-3j-11k

Answer 13

Maybe it's asking for the cross product...

Answer 14

A dot product will always result in a scalar.

Answer 15

hm, maybe it didnt really specify

Answer 16

then yes I guess. I don't know how to do cross product

Answer 17

Though I'm assuming the answer is the one with the -3j, since that was our dot product answer

Answer 18

@steve816

Answer 19

Noope, you can't always go with that.

Answer 20

yeah, but that would be my only guess

Answer 21

@steve816 do you know how to do cross product?

Answer 22

nevermind! I figured it out

Answer 23

Awesome!