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Math Help - Need help on TI-89 to solve Complex number

  1. #1
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    Need help on TI-89 to solve Complex number

    I know how to use "simple" complex number on TI-89
    for example: 8+i3

    but how about if there is two equations and we want to solve for x and y:
    for example: (1+i1.5)x + i2.5y=20 and 11x + 15y=0
    solve for x and y.

    Is it possible to do the calculation using solve(
    I tried to do it, but I kept getting "false" answer.

    Any responds would be GREATLY appreciated.

    Best regards,
    RC
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  2. #2
    Moo
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    Quote Originally Posted by ry4n_cruise View Post
    I know how to use "simple" complex number on TI-89
    for example: 8+i3

    but how about if there is two equations and we want to solve for x and y:
    for example: (1+i1.5)x + i2.5y=20 and 11x + 15y=0
    solve for x and y.

    Is it possible to do the calculation using solve(
    I tried to do it, but I kept getting "false" answer.

    Any responds would be GREATLY appreciated.

    Best regards,
    RC
    Hello,

    Did you use the special i button ?
    Are x and y real numbers or complex numbers ?
    What did you enter exactly ?
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  3. #3
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    Yes, I use special i,
    and I want X and Y will have answers something like a+Bi

    Could you please help me?
    thank you very much
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  4. #4
    Moo
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    Quote Originally Posted by ry4n_cruise View Post
    Yes, I use special i,
    and I want X and Y will have answers something like a+Bi

    Could you please help me?
    thank you very much
    Try :

    cSolve((1+i*1.5)*x+i*2.5*y=20 and 11x+15y=0, {x,y})

    cSolve is for solving in the set of complex numbers.
    (I've always liked to put * for multiplying, because it sometimes yield errors, so I find it wiser to do it the first time ;p)

    -------------------
    Yay ! It works

    And just so you know, you don't need the * here
    Last edited by Moo; May 14th 2008 at 11:43 AM. Reason: typos
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