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Math Help - Solve function with Y functions?

  1. #1
    Zets
    Guest

    Solve function with Y functions?

    Hello, I am having a problem using the Solve() function with equations with the Y function in them. I have a TI-89 Titanium.

    Here are my Y functions:
    Y2: B+2*C+3*D+F-G+K
    Y3: K*(C-A+2*D+F-G)+K*L-O
    Y4: K*L*(D-2*A-B+F-G)+K*L*M-K*O
    Y5: K*L*M*(F-G-3*A-2*B-C)-K*L*O
    Y6: -K*L*M*O

    My Solve function is:

    Solve(X^5+Y2()*X^4+Y3()*X^3+Y4()*X^2+Y5()*X+Y6()=0 ,X)
    I am getting the "Too few arguments" error.

    I have also made a program for storing in the values of A,B,C,D,F,G,K,L,M, and O

    A = .056
    B = 0
    C = 0
    D = 0
    F = 0
    G = 0
    K = .00066
    L = 0
    M = 0
    O = 10^-14

    After storing these values, I proceed to use the solve function but I am unable to do so.
    Edit: I plugged in the Y equations and it worked, but I still would like to know if it's possible to keep the Y(n) in the original equation.
    Last edited by Zets; March 27th 2007 at 04:25 PM.
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  2. #2
    Super Member
    earboth's Avatar
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    Quote Originally Posted by Zets View Post
    Hello, I am having a problem using the Solve() function with equations with the Y function in them. I have a TI-89 Titanium.

    Here are my Y functions:
    Y2: B+2*C+3*D+F-G+K
    Y3: K*(C-A+2*D+F-G)+K*L-O
    Y4: K*L*(D-2*A-B+F-G)+K*L*M-K*O
    Y5: K*L*M*(F-G-3*A-2*B-C)-K*L*O
    Y6: -K*L*M*O
    Hello,

    when you store the term of a function with the Y=-editor you have to use an independent variable (mostly x). Otherwise your functions are constants. Have a look at the entry row of the y=-editor: It starts with y1(x)=

    My Solve function is:

    Solve(X^5+Y2()*X^4+Y3()*X^3+Y4()*X^2+Y5()*X+Y6()=0 ,X)
    I am getting the "Too few arguments" error....
    This error occurs because you used an empty bracket with the name of the function. If the name of the independent variable is x then you have to use yn(x)

    EB
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