Question

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

Answer 1

@phi would I just multiply this normally?

Answer 2

a constant times a vector means multiply each element of the vector by that constant.

example: c * <a,b> = <ac, bc>

to add vectors, you add corresponding elements

Answer 3

so it'd be <28,-12>-<-27,15>

Answer 4

yes

Answer 5

I got <55,-27>

Answer 6

yes

Answer 7

Thank you soooo much! :D This vector stuff is finally starting to make sense!

Answer 8

and (if you do "technical work" ) is very useful