Question

vectors

Answer 1

??

Answer 2

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

Answer 3

oh ok
hold on let me think

Answer 4

okay

Answer 5

um this is pretty hard. what grade are you in??

Answer 6

11th its precalc

Answer 7

For vector u, multiply each component by 4. For v, multiply by 3.
When adding or subtracting vectors, use the components in the similar position.

Answer 8

wait so you multiply -9, 5 by 3?

Answer 9

yes

Answer 10

so its -28, 15

Answer 11

and 7,-3 would be 28, -12

Answer 12

and together it would be 0, 3?

Answer 13

Err, you messed up vector v, hold on. Forget about the subtraction sign. Look again at your math for vector v and rewrite it.

Answer 14

7 times 4=28 and -3 times 4=-12 though....

Answer 15

That's vector u. The other vector lol.

Answer 16

okay but -9 times 3= -28 and 5 itmes 3=15

Answer 17

Eh, almost. -9*3 is -27.
So this is what we have now:
<28,-12> - <-27,15> . Easy artihmetic now.

Answer 18

so 1,3

Answer 19

No :3 Look again. We're subtracting the vectors
X-component: 28 - (-27) = ?
Y-component: -12 - 15 = ?

Answer 20

oh so 55, -27

Answer 21

Yes ma'am. :D

Answer 22

yay c: here ima post another question can you help with that one?

Answer 23

ok