Babynini
  • Babynini
Elementary question. |u+v| = ? u=<1,3> v=<-6,2>
Mathematics
schrodinger
  • schrodinger
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Babynini
  • Babynini
I got <-5,5> but apparently this is not correct..I think it has to do with the | |
jim_thompson5910
  • jim_thompson5910
you got u+v = <-5,5> correct but they want the length of u+v
Babynini
  • Babynini
oo how do I do that?

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Babynini
  • Babynini
|v| = sqroot (a^2+b^2)
Babynini
  • Babynini
but how do I do |u+v| ?
jim_thompson5910
  • jim_thompson5910
think of u+v as one vector
jim_thompson5910
  • jim_thompson5910
= <-5,5> a = -5 b = 5
jim_thompson5910
  • jim_thompson5910
then you use that formula you had posted |z| = sqrt(a^2+b^2) z = u+v
Babynini
  • Babynini
would it come out to sqroot 50 ?
jim_thompson5910
  • jim_thompson5910
you can simplify that
Babynini
  • Babynini
\[5\sqrt{2}\]
jim_thompson5910
  • jim_thompson5910
correct
Babynini
  • Babynini
Fantastic. thanks :)
jim_thompson5910
  • jim_thompson5910
no problem

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