anonymous
  • anonymous
vector= <-3,4> vector u= <2,5> medal!!! find u-v find -2v find u times v find the magnitude and direction of u
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Loser66
  • Loser66
|dw:1433551562751:dw| right?
anonymous
  • anonymous
yep @Loser66
Loser66
  • Loser66
|dw:1433551686065:dw|

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More answers

anonymous
  • anonymous
1
Loser66
  • Loser66
yup
anonymous
  • anonymous
then for -2v?
Loser66
  • Loser66
|dw:1433551751106:dw|
anonymous
  • anonymous
0
anonymous
  • anonymous
@Loser66
Loser66
  • Loser66
how??? (-2)*(-3)= 6 (-2)*4 = 0?????
anonymous
  • anonymous
-8 my bad
Loser66
  • Loser66
ok
anonymous
  • anonymous
and for the next for is it -6,20
Loser66
  • Loser66
noooooooooooooooooope in vector, you don't have multiplication . YOu only have dot product; it is not multiplication
anonymous
  • anonymous
wait what
Loser66
  • Loser66
\(\vec u\bullet \vec v\)
Loser66
  • Loser66
it is not "times" . It is dot product.
anonymous
  • anonymous
how do u do that
anonymous
  • anonymous
(-6) + 20 = 14
Loser66
  • Loser66
= first u * first v + second u * second v where u = < first, second> and v = < first, second>
Loser66
  • Loser66
yup, you are correct
anonymous
  • anonymous
and i don't get the find the magnitude and direction of u
Loser66
  • Loser66
\(||\vec u||= \sqrt{first ^2 + second^2}\)
anonymous
  • anonymous
so 7
Loser66
  • Loser66
redo
anonymous
  • anonymous
27?
Loser66
  • Loser66
direction of u : hit the calculator: \(tan^{-1}\), after the menu pop up, type \(\dfrac{second}{first}\) then enter for magnitude of u : \(\sqrt{2^2 + 5^2 }=???? \)
anonymous
  • anonymous
i can't find my calculator
Loser66
  • Loser66
use google
anonymous
  • anonymous
i get seven
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=√2%5E2%2B+√5%5E2
anonymous
  • anonymous
@Loser66
Loser66
  • Loser66
OMG!!! \(||u||= \sqrt{29}\)
anonymous
  • anonymous
lol thank;)
Loser66
  • Loser66
direction of u is 68.2 degree
anonymous
  • anonymous
thanks again

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