Question

Let u = <7, -3>, v = <-9, 5>. Find 4u - 3v.

Answer 1

@asnaseer

Answer 2

Do you multiply the u by 4 and get <28,-12> and the v by 3 and get <27,-15> ?

Answer 3

correct

Answer 4

add them to get <55, -27>

Answer 5

subtract each component

Answer 6

subtract

Answer 7

but when you multiply by a -3 wouldn't you end up adding them?

Answer 8

or do you just multiply by a positive 3 then subtract them?

Answer 9

oh sorry - I see what you did - then yes add them

Answer 10

you would normally multiply by positive 3 and then subtract :)

Answer 11

Oh okay.Well thanks again :D

Answer 12

what you did was 4u + (-3v)

leads to the same answer

Answer 13

yw :)

Answer 14

Alright (: Thank you