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Calculators TI-89 Calculator

  1. Oct 20, 2004 #1
    I'm having some trouble solving inequalities with the TI-89. Let's say that I want to solve [tex]x^2<1[/tex] The answer should be [tex]<-1,1>[/tex], if I type in solve(x^2<1,x), but that's not what I get. It only returns the inequality itself just as I typed in. What's wrong??
     
  2. jcsd
  3. Oct 20, 2004 #2
    i will have to check the set up but if its all entered correctly make sure you clear your varables so you don't have x stored as something
     
  4. Oct 20, 2004 #3
    I don't think that the TI-89 will solve inequality equations. You'll have to separate the inequality into two separate equations and solve them separately.

    If the TI-89 does have this function, I am unaware. Just checking my manual it doesn't look like it.
     
  5. Dec 31, 2008 #4
    TI 89 is pretty complicated. I had a similar problem and a Person I know that works a t Texas Instrument Company that makes calculators claims it doesn't do inequalities and is a ripoff for what it seems. aerognr is right.good Luck though!!!:)
     
  6. Dec 31, 2008 #5
    This is quite surprising to me because I have a TI-89 Titanium and it can easily solve inequalities. Writing your original query I got: -1<x<1. I was under the impression that the CAS was identical, but apparently they upgraded it.
     
  7. Jan 1, 2009 #6
    try :

    solve(sign(factor(x^2-1))=-1,x)
     
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