Question

Vectors on a plane please help!?

Answer 1

Let u = <-5, -9>, v = <6, 8>. Find -8u - 2v.

<52, 88>
<-8, 2>
<112, -28>
<28, 56>

Let u = <-7, -2>. Find 8u.

<56, 16>
<-56, 16>
<-56, -16>
<56, -16>

Answer 2

@ganeshie8

Answer 3

Hey!

Answer 4

Ok the page finally loaded

Answer 5

I'm not sure why it takes so long to load

Answer 6

Are you still here?

Answer 7

The lesson does not explain this well, is there a formula or something I can use?

Answer 8

Let u = <-7, -2>. Find 8u.

Answer 9

multiply each component of \(u\) by 8

Answer 10

u = <-7, -2>
8u = <-7*8, -2*8> = ?

Answer 11

-56, -16?

Answer 12

<-56, -16>

Answer 13

That's easier than it looks.

Answer 14

Can you try the first problem ?

Answer 15

Let u = <-5, -9>, v = <6, 8>. Find -8u - 2v.


-8u = ?
-2v = ?

Answer 16

I will
-8u = -5*-8, -9*8 = 40, 78
-8u = 6*-8, 8*-8 = -48, -64

Is this right so far?

Answer 17

-2v = -5*-2, -9*-2 = 10, 18
-2v = 6*-2, 8*-2 = -12, -16

Answer 18

I feel like I ended up with too many numbers

Answer 19

Just find -8u and -2v

Answer 20

u = <-5, -9>
-8u = ?

Answer 21

-5*-8 = 40, -9*-8 =72

Answer 22

u = <-5, -9>
-8u = <40, 72>

Answer 23

v = <6, 8>
-2v = ?

Answer 24

So
<40,72>
And then
6*-2 = -12, 8*-2 = -16
So
<-12,-16>

Answer 25

Yes, add them both :

-8u - 2v
= -8u + -2v
= <40, 72> + <-12,-16>
= ?

Answer 26

40 - (-12) = 52
72 - (-16) = 88
<52,88>

Answer 27

Oh so <28, 56>

Why add