Question about Texas Instruments TI-89 Calculator

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I am having trouble figuring out why my ti 89 has trouble figuring out integrals. for example i know that the integral of x^2 is x^3/3+c but my ti 89 gives me the answer in a decimal of fraction form. i do not understand why. this also happens when i am trying to factor or find zeros. but mainly, i need help why the integrals do not work. thank you

Posted by richygu30 on

  • kakima May 11, 2010

    Which form are you getting it, in decimal or fraction? Which way do you want it? Can you post exactly what you're entering and what the calculator is producing?

    Press MODE, then F2. What is the Exact/Approx setting?

    FYI my TI-89 produces x^3/3 when I integrate x^2.

  • tang_lx1988
    tang_lx1988 Mar 01, 2012

    I typed in "F3 2 x ^ 2 , x )"then it gives me 2706867/15625

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k24674

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The calculator does not give a result of an integration with a constant. The form of the result will depend ob the EXACT/APPROXIMATE mode you have selected.
In the following screen capture, your integral has been evaluated with mode set to EXACT,AUTO, and APPROXIMATE. Pay attention to the syntax.

i am having trouble figuring out why my ti 89 has - 60131ab.jpg

To set the computational mode to EXACT, press the MODE button use the Function keys F1,F2 or F3 to move from page to page, point to EXACT/APPROX and use the right arrow key to unfold the submenu, then the Up or Down arrow to select AUTO, EXACT or APPROXIMATE and press ENTER to SAVE Configuration.
If the integral cannot be found in EXACT mode, the calculator will echo the command without calculating the integral.

Posted on Apr 29, 2010

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