Question

vectors in a plane
Let u = <-7, -2>. Find 8u.

Answer 1

multiply 8 with the u vector

Answer 2

okay so its -56 -16

Answer 3

yeah but put it in proper notation like <-56, -16>

Answer 4

oh
okay ididnt kno it was that simple

Answer 5

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

Answer 6

im going to do this one

Answer 7

careful while you can multiply the same way when subtracting it's u1-v1, u2-v2 because u = <u1,u2,...un> and v = <v1,v2,...vn>
u-v = <u1-v1, u2-v2,...un-vn>

Answer 8

ok i didnt kno tht, thanks!

Answer 9

Calc III is easy what I'm dealing with is crazy XD

Answer 10

lol what are u dealing with?

Answer 11

differential equations proving something ughhh

Answer 12

are you in college?

Answer 13

yup. I'm gonna attempt something and post it on here. I figure if i solve it first like I usually do, then I might get it.

Answer 14

okay so far i got 4(7,3)-3(-9,5)

Answer 15

multiple the 4 with <7,3> - multiply 3 with <-9,5>

Answer 16

<28,12>-<-27,15>

Answer 17

is it <1,3>

Answer 18

hmmm...
<28-(-27)>,<12-15>

Answer 19

<55,-3>

Answer 20

yes

Answer 21

its not in my answer choice

Answer 22

huh? What are your answer choices?

Answer 23

oh crud my bad. I don't think you have to distribute the negative. try <1,-3>

Answer 24

<28-27>,<12-15>

Answer 25

yh i think its tht :)

Answer 26

it's been a ywear since I've done some, but I still remember some of it

Answer 27

okay what do i do for this one
Let u = <-4, -3>. Find the unit vector in the direction of u, and write your answer in component form.

Answer 28

gotta find the formula or the format for component form. I need to finish my stuff. sorry.

Answer 29

ok but thank you soo much :D