Question about Texas Instruments TI-89 Calculator

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Different answer fro my TI-89 AND MY tI-81

Hi sorry everyone, not the brightest light in the shop when putting in this sum on my ti-81 9492 x 2 pi then 1000 / ans then *360 my ti-81 gives me the answer 6.036217816 on my ti-89 i do the same sum to get 15000/(791*pi)

please could anyone help im a bit thick

many thanks john

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In addition to k24674's explanation, you can convert from a symbolic answer to a numeric answer by pressing Diamond then Enter.

Posted on Jan 18, 2010

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Hello,
Your TI81 can only perform numerical calculation: It always give uour numbers. The TI89, a more sophisticated calculator, can of course do numerical calculation, BUT ALSO symbolic ones. You ask it for the derivative of sin(x) and it will give you cos(x).
Anyway, if you want a decimal result for you calculation above one of the numbers must have a decimal point (instead of writing 2PI write 2.PI.

The TI 89 can do exact calculations. But if you want approximate results any number in the sequence of operations must have the mark of a decimal. Numbers without decimal marks are considered integers, Integer numbers with a decimal mark are treated as floating point numbers ( meaning decimal).

Hope it clarifies things for you.

Posted on Sep 05, 2009

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Oct 19, 2016 | Miscellaneous

1 Answer

How do I graph an equation with TI 89?


Just open the Y= equation editor and enter your equation. Use X for T. Make sure the angle unit is in radians.

Nov 10, 2014 | Texas Instruments TI-89 Calculator

1 Answer

How can i see the real number pi in decimals in my ti-89?


To get a numerical value for a single result, press the diamond button then the ENTER button. To have all results come out numerically, press MODE F2, scroll down to the Exact/Approx line, right-arrow, select 3:APPROXIMATE, then press ENTER ENTER.

Dec 26, 2012 | Texas Instruments TI-89 Calculator

1 Answer

Making PI a variable in TI-82 Calculator


The calculator does not have a Computer Algebra System or CAS: It cannot handle non numerical quantities. Every letter symbol must have a value stored in it prior to being used. If no value is stored in a letter symbol, value 0 is assigned to it. Sorry.
As to calling Pi a variable, I would not got that far, even if the calculator would give me 2Pi.
TI calculators that have a CAS are the TI92 Plus, the Voyage 200 PLT, and the TI Nspire CAS, TI Nspire CX CAS.

Apr 14, 2012 | Texas Instruments TI-82 Calculator

1 Answer

TI-89 incorrect answer


You're not doing anything wrong. The TI-89 simply does not reduce odd powers in square roots. If you change the 13 to 14 you'll see a rather different result.

Apr 11, 2012 | Texas Instruments TI-89 Calculator

2 Answers

How do i enter this question on a ti 89? 5 sin(2 pi 2000 t +60 degrees) does anybody know i would appreciate it.


Hi ssmith63,
Put the calculator in radian angle mode. The top answer is in AUTO mode and, The bottom is in Approx mode.

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I converted 60 degrees into pi/3 radian which equals 1.0472 radians. I figured 5 significant digits was good enough since, you only went 4. If you have any question just post them and, I'll respond quickly.

Jan 15, 2011 | Texas Instruments TI-89 Calculator

1 Answer

What does "@n4" on the Ti-89?


The "@n" followed by a number represents an arbitrary integer. For example, "@n1 pi" represents a solution at every integer multiple of pi.

May 20, 2010 | Texas Instruments TI-89 Calculator

1 Answer

I JUST GOT MY ti-8today and don't know how to use it


To do fractions, input like this:
(1/3)+(4/9)
Granted the answer is a decimal... But you should be able to convert that to a fraction using what you've learned in math class.

PI sign: Just press [2nd]and then[^]. And voila, instant π! Exponent:enter more complicated expressions involving exponents using parentheses and the negative sign.
For further guide read: http://www2.stetson.edu/~mhale/teach/ti83.htm and http://education.ti.com/educationportal/downloadcenter/SoftwareDetail.do?website=US&appId=6124&tabId=2
Please rate this!!

Aug 16, 2009 | Texas Instruments TI-81 Calculator

1 Answer

Can you Factor on a TI-84? IF not, does the TI-89?


Well, to answer part of your question, yes... the TI-89 does factor like this. it is inputted like this:

factor(6*x^2+11*x+4,x)

Check the catalog in the TI-84 (which is 2nd-zero) and look under F for factor()

Jan 12, 2009 | Texas Instruments TI-89 Calculator

1 Answer

Different answer two different calculators ti-81 and ti89


I had the same problem when I got my first 89, even though it's really a feature and not a problem.

Press the diamond key then enter to get your answer, and it will give you the decimal answer instead of the exact answer like you have been getting. Hope this helps...

Nov 15, 2008 | Texas Instruments TI-89 Calculator

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