Question about Texas Instruments TI-89 Calculator

# How do I enter negative number in TI 89 - Texas Instruments TI-89 Calculator

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Use the (-) key next to the decimal point key to enter negative values. The - key is to subtract one value from another.

Posted on Nov 06, 2010

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Posted on Jan 02, 2017

On the bottom of the calculator near the zero and the enter key it has the symbol (-) that is a negative number symbol

Posted on May 01, 2009

Use the change sign key marked (-) or +/-. Press the (-) key then the number.

Posted on Jun 24, 2012

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Hello,
You are not using the right syntax. It has to do with priority of operations. raising a number to a power has priority over the negation sign (the change sign key). Th operations you are performing are treated as follows.
1. The square of 2 is calculated first (4),
2. then the negation (change sign) is performed, giving -4.

To get what you intend, namely the square of a negative number, you should enter the calculation as follows.
(-2)^2.
Since the parentheses have priority over everything else, the negation of 2 is calculated first, giving -2, then the power is performed next, and the result should be 4

If you need convincing, here is a screen capture.

Hope it helps.

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### Negitive powers

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10^-3

If this doesn't give the right result, put the negative power in parentheses. I can't remember off hand if you need to do that or not.

10^(-3)

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

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.

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Hope it clarifies things for you.

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