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Expression Help

  1. May 9, 2006 #1
    Express (10 + 5i) / (2 - i) in the form x + y*i.

    Not sure what to do and I was wondering if I could get some help :S
     
  2. jcsd
  3. May 9, 2006 #2

    Tom Mattson

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    Yep, you start by multiplying the numerator and denominator by the complex conjugate of the denominator. This is called rationalizing the denominator.
     
  4. May 9, 2006 #3
    My textbook doesn't have the answer for the question...
     
  5. May 9, 2006 #4

    Tom Mattson

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    Ooookaaaay, but that doesn't mean you can't do the problem. give it a shot and let's see what you come up with.
     
  6. May 9, 2006 #5
    I got 3+4i for the answer.
     
  7. May 9, 2006 #6

    berkeman

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    Correctomundo! Remember that trick that Tom reminded you of -- you'll use it a lot.
     
  8. May 9, 2006 #7
    Sweeeet! Thanks ^^
     
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