Question

I keep getting <64,-24>.
Let u = <7, -3>, v = <-9, 5>. Find 4u - 3v.

<55, -27>

<1, 3>

<16, 12>

<-8, -6>

Answer 1

@hartnn

Answer 2

show us your solution

Answer 3

Okay one moment

Answer 4

> this means ???
are u talking about ..... )

Answer 5

<7--9,-3-5> which when I multiplied the left by 4 and the right by 3 I got <64,-24>

Answer 6

find 4u first

u = <7,-3>
4u = <4*7 , 4*(-3)> = ... ?

Answer 7

then find 3v
v = <-9,5>
3v = <3(-9), 3*5>

then subtract them

Answer 8

vector notation
u =<7,-3> means
u = 7i -3j
gorv

Answer 9

So u=<28,-12>, v=<27,-15>?

Answer 10

no, thats 4u and -3v

Answer 11

so add them

Answer 12

I got <4,3>

Answer 13

how ?

Answer 14

4u -3v = <28+27, -12-15>

Answer 15

I mean 55,-27

Answer 16

then you're correct :)

Answer 17

Thanks so much for the help:)

Answer 18

welcome ^_^