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Math Help - program on TI-84

  1. #1
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    Smile program on TI-84

    Does anyone know the program to solve the polynomial on graph calculator. Ti-84.

    For example: y = x^3 + 3x^2+ 5x + 6

    or y = x^4....ans so on.

    with this, when doing a problem, if you don't remember or take time to factor it out. So the program might also help you save a lot of time during exams or homework.

    if anyone know this program, could you please give it to people, so people can share it. Thanks a lot for your generous.
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  2. #2
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    TI-84 solve function

    when you say solve y = x^3 + 3x^2+ 5x + 6 etc.

    what do you mean? do you mean solve for x in terms of y?
    or solve for y = 0?

    or what?
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  3. #3
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    i mean, factor it out, that function is quite easy to factor because when pull the x out. x(x^2 + .............). However, if i have a function , f(x) = x^3 - 3x^2 - 5. how do you factor it on TI 84 calculator ? Thanks.
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by distance
    i mean, factor it out, that function is quite easy to factor because when pull the x out. x(x^2 + .............). However, if i have a function , f(x) = x^3 - 3x^2 - 5. how do you factor it on TI 84 calculator ? Thanks.
    It depends on the polynomial. Sometimes the command "simplify" will work. I don't recall if there is a "factor" function on the 84.

    If the polynomial has integer zeros (possibly rational zeros) it may factor the expression. However, if some of the zeros are complex it won't do anything.

    As far as writing a program to do the trick, you can do it for polynomials up to and including 4th degree (if you can find the formulae for solving cubics and quartics) but I can tell you from experience programming for all eventualities is a pain!

    -Dan
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  5. #5
    Grand Panjandrum
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    Quote Originally Posted by distance
    i mean, factor it out, that function is quite easy to factor because when pull the x out. x(x^2 + .............). However, if i have a function , f(x) = x^3 - 3x^2 - 5. how do you factor it on TI 84 calculator ? Thanks.
    I don't have a TI 84, but I believe that the CAS is based on DERIVE
    and in DERIVE the factor function will do the job (with the correct options
    set anyway) see attachment.

    RonL
    Attached Thumbnails Attached Thumbnails program on TI-84-gash.jpg  
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  6. #6
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    Quote Originally Posted by distance
    i mean, factor it out, ...
    Hi,

    I'm sorry to say but you can't do that with a TI84.
    The TI84 calculates only with numbers. The letter keys which you hit when typing on a TI84 are only addresses of storage places. (For instance: You can't type commands letter by letter but you have to pick them out of a menu list)

    The first TI which do symbolic calculation is the TI89. There a small version of Derive is implemented, and there you'll find the factor-command in the menu F2:Algebra.

    But maybe there are additional programs which you can download from the TI website.

    Bye

    EB
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  7. #7
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    Yes I know the thread is old but just in case anyone is interested there is a program that does this....

    A program called PolySmelt or otherwise known as Poly Root Finder and Simultaneous Equation solver will do the trick for you, well it works on my TI-83 and works on other people's that have a TI-84. Not sure where you can download it, TI website should help. Its a simple program to use and a handy one for finding roots of polynomials.
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  8. #8
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    Quote Originally Posted by Random333
    Yes I know the thread is old but just in case anyone is interested there is a program that does this....

    A program called PolySmelt or otherwise known as Poly Root Finder and Simultaneous Equation solver will do the trick for you, well it works on my TI-83 and works on other people's that have a TI-84. Not sure where you can download it, TI website should help. Its a simple program to use and a handy one for finding roots of polynomials.
    I do not own a TI but when I used someone elses and found a way to solve simulatenous equations. You need to use the matrix feature they have in the calculuator.

    1)Line up your equations. Varaibles with variables.
    2)Go to the Matrix section.
    3)Make a new matrix "A" of dimensions n x n where n is the number of variables (or the number of equations).
    4)Type in the representative coefficients in the matrix.
    5)Make a new matrix "B" of dimension n x 1 where.
    6)Type in the representative constant coefficients (the numbers in right of the equal sign).
    7)Leave and enter the main screen.
    8)Type in
    Code:
    A^(-1)B
    9)The new matrix with have representative solutions to this linear system.
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