Question about Texas Instruments TI-89 Calculator

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How do I enter a quadratic equation into my calculator TI 89?

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  • Anonymous Jan 18, 2009

    how

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Hello,
What do you want to do with it? If you want just to enter it, you do so on the command line.
Here are exemples of solutions
Under [Mode][F2] exact/aprox set to exact
solve(x^2+x-5=0,x) finds the exact solutions the top ones

How do I enter a quadratic equation into my calcul - b255a8b.jpg
Under [MODE][F2] Exact/Aprox set to Approximate you get approximate numerical solutions, the bottom ones.
There is another command nSolve( which solves numerically for an equation. You can specify a range of values where solution is suspected to be.

Hope it helps

Posted on Sep 13, 2009

  • k24674 Sep 13, 2009

    If you know the command you can type it in, without looking in the command calatog.

  • k24674 Sep 16, 2009

    To enter an equation in your calculator you store it in a variable.
    Name the variable some thing special, to avoid conflicts with existing variables you might have created and forgotten. Let us store a quadratic equation in a variable called ekwa2;
    3x^2-0.73x+ 19/3 = 0 [STO-->] ekwa2 [ENTER].
    If you want to solve it using the solve( command you type solve(ekwa2, x) [ENTER]
    The variable x you put in the solve( command must be the same as you put in the definition of ekwa2.


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Posted on Apr 04, 2009

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SOURCE: HOW DO YOU ENTER r2 ON A TEXAS INSTRUMENT CALCULATOR?

Hello,
No need to enter R squared. If it has meaning it will display in the stats variables screen ( 2nd F7 ).
Hope it helps.

Posted on Sep 14, 2009

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