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How did they rewrite this?

  1. Oct 13, 2009 #1
    How did they rewrite this?

    A = 1 / (-2 + 4i)

    A = -(1/10) - (1/5)i
     
  2. jcsd
  3. Oct 13, 2009 #2
    Multiply the numerator and denominator of A by the complex conjugate of -2 + 4i
     
  4. Oct 13, 2009 #3
    That's what I was thinking but wasn't sure. I haven't had to do that in a long time. lol.
     
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