1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Copmlex Number

  1. Apr 9, 2009 #1
    i've confused myself

    [itex]\frac{1}{i}=-i[/itex] by multiplying by i/i

    but then [itex](\frac{1}{i})^2=-1 \Rightarrow \frac{1}{i}= i,-i[/itex]
    and clearly the positive root here doesn't make any sense???
     
  2. jcsd
  3. Apr 9, 2009 #2
    You are correct but you forgot to take the negative root of the left hand side.
     
  4. Apr 9, 2009 #3

    Pengwuino

    User Avatar
    Gold Member

    Well you've somewhat answered your own question. You simply did pick the incorrect root as there are always 2 roots to a square root

    [tex]\[
    \begin{array}{l}
    3 = 3 \\
    3^2 = 3^2 \\
    9 = 9 \\
    \sqrt 9 = \sqrt 9 \\
    3 = - 3? \\
    \end{array}
    \]
    [/tex]

    for example.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Copmlex Number
  1. Copmlex Integration (Replies: 6)

  2. Copmlex Analysis (Replies: 5)

  3. Reynolds Number (Replies: 2)

Loading...