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Calculators Ti-89 exact/approx

  1. Apr 18, 2009 #1
    1. The problem statement, all variables and given/known data
    Recently got a ti-89 and when I use it to derive for example d(x^2+4x-10, x)
    I get a decimal, 5.27 instead of getting 2x+4.

    3. The attempt at a solution
    I tried changing the mode to exact, approx, and auto. All give the same answer.
    I tried pressing the diamond button before ENTER, only in the exact mode it gave me a fraction.
  2. jcsd
  3. Apr 18, 2009 #2
    Press 2nd, F1 (to get to F6), then "Clear a-z".

    Apparently, you have the value of .635 stored as x. :tongue2:
  4. Apr 18, 2009 #3
    Yay 2x+4!
    Haha thanks.
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