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Ti 89 calculator not working?

  1. Feb 24, 2009 #1
    i went to this site: http://antaki.ca/TI89Tutorial/#poly
    and typed in different commands and none of them seem to be working.
    when i integrate sin(x) it just says ".989992"

    when i did expand((x+4)^4,x) it just says "2401."
    when i do factor(x^2-9,x) it says "0"
    so i tried factor(x^2-9=0,x) and it says "true"

    the only thing that worked so far is:
    solve(x^2-9=0,x) and came out as "x=-3 or x=3"
    even though that website didnt tell me to put that in

    does anybody know how to fix this?
    i have ti-89 titanium OS 3.1 hardware version 4.00
  2. jcsd
  3. Feb 24, 2009 #2
    Sounds like you have 3 stored in for x. Type x at the prompt, it should probably give you the value 3. To fix this just press F1... then scroll over to F6. From there, select the option that says "1. Clear a-z"
    Last edited: Feb 24, 2009
  4. Feb 24, 2009 #3
    o cool, its fixed, thanks!
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