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Math Help - Ti-89 Titanium, expand and factor functions

  1. #1
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    Ti-89 Titanium, expand and factor functions

    based on the manual I cannot get expand and factor to work properly and get error messages. Please help, test tomorrow!
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  2. #2
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    Press F2, which is the algebra menu. Then 'factor'. Press in your expression and you should be set. Give me an example so I may have a better idea of what's going on. Tell me exactly what your are doing, thus resulting in the error message.
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  3. #3
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    Ti-89 expand/factor

    I follow the examples in the manul for example on page 50 of the manual which I mimic precisely:
    f2 3 ( x - 5 ) ^ 3 ) enter
    the response I get back is non-algebraic variable in expression
    Additionally:
    On page 51 of the manual the factoring example results in the same response as above. Example: f2 2 x ^ 2 - 5 , x )enter.

    Thanks for your help
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  4. #4
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    I have a TI-92. They're almost identical in how they work. Here's a screen capture.
    Last edited by galactus; November 24th 2008 at 05:38 AM.
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  5. #5
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    Quote Originally Posted by chiph2@comcast.net View Post
    I follow the examples in the manul for example on page 50 of the manual which I mimic precisely:
    f2 3 ( x - 5 ) ^ 3 ) enter
    the response I get back is non-algebraic variable in expression
    Additionally:
    On page 51 of the manual the factoring example results in the same response as above. Example: f2 2 x ^ 2 - 5 , x )enter.

    Thanks for your help
    It looks like as if the variable x contains a value. To start with press F6 and clear all one letter variables.
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  6. #6
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    I thought of that, but when a numerical value is entered into variable x, mine still returns the factored form of the number.

    Let's say we wanted to factor x^{2}+2x+1

    If, say, 3 were stored in x, I just get back 2^4 instead of (x+1)^{2}
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  7. #7
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    Quote Originally Posted by galactus View Post
    I thought of that, but when a numerical value is entered into variable x, mine still returns the factored form of the number.

    Let's say we wanted to factor x^{2}+2x+1

    If, say, 3 were stored in x, I just get back 2^4 instead of (x+1)^{2}
    X might have been defined to be a matrix. earboth's advice should be followed.
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  8. #8
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    Exactly. I hadn't thought of that.

    I clean mine regularly because some programs do not have local variables and do not delete them when the program is done running.
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  9. #9
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    Quote Originally Posted by galactus View Post
    [snip]

    I clean mine regularly because some programs do not have local variables and do not delete them when the program is done running.
    Excellent recommended practice.

    Most students are running all sorts of games programs - who knows what some of those programs are doing .......
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  10. #10
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    thanks

    thanks a bunch guys! the f6 clear a-z was the deal! : )
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