Question about Texas Instruments TI-89 Calculator

# 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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• Texas Instru... Master

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

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 Jan 02, 2017

(a-b)3

Posted on Apr 04, 2009

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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Hello,
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Hope it helps.

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