Question

Given u = (-2, -6) and V = 3, -3, find U times V. Do I just multiply them together??

Answer 1

So V=(3,-3) ? or V=3,-3

Answer 2

the first one

Answer 3

So there is a rule to multiply ordered pairs :
\[ (a,b) * (c,d) = (ac-bd,ad+bc) \]

Answer 4

So the Answer is that you have to multiply them.

Answer 5

This could be a "dot product"
???

Answer 6

i got -24 and -2 but idk where to go from here

Answer 7

Because if you got that then that must be the answer :

(-24,-2)

Lemme Check this quick :)

Answer 8

its not one of my choices though :( i have -24, -6, 12, =12, 24...i got -24 but what would i do with the -2

Answer 9

Is there more background on this problem?
I would guess it is a dot product
\[(a,b) \cdot (c,d)= ac+bd \]

Answer 10

@phi Thanks for the feedback that can be it.

Answer 11

that's probably it, the question just doesn't say much so i was confused on which formula i had to use. let me try it

Answer 12

I am sure they have mentioned this in class...

Answer 13

@phi What was my formula related to ?

Answer 14

i got 6..

Answer 15

try again

Answer 16

@hba if you treat the pairs as real, imaginary you get your formula

Answer 17

never mind i got 12! i see what i did wrong

Answer 18

Thank you. @phi

Answer 19

Also, class should have mentioned that
\[ u \cdot v= |u| |v| \cos(\theta)\]

Answer 20

Vectors :)

Answer 21

yes I have this formula, but all the notes and example problems that my teacher has given me does not have any problems that are worded with "determine the quantity to indicate the following". The ones he has given me instructs which formula to use..thats why I was confused. Thank you for your help.

Answer 22

your'e welcome.