Question about Texas Instruments TI-83 Plus Silver Edition Calculator

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Find square of -x

I could have sworn that 2 days ago when I entered (-x)^2 i got x. Now when I enter the same thing I get 100. How do I fix this?

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Hello,

I do not know how you could have obtained the first result: The only possibility is that your X has been assigned a value of 1. Even if it was the case, the calculculator shown on the left (TI83PLUS SILVER Edition) does not do symbolic algebra.

For the second case, I suspect some way or other, the variable X store a value of 10. When you enter (-X)^2 the calculator retrieves the value stored in the variable X and performs the calculation, which does yield 100.

Note: to store a value in one of the 26 variables (letters) you proceed as follow
10 STO-> ALPHA X
The screen displays 10->X
When you press ENTER it displays 10.0..

To recall a value stored in the X variable you type
2ND RCL ALPHA X.

Hope it clarifies the question.

Posted on Aug 20, 2009

  • k24674 Dec 25, 2009

    To calculate the square of a negative number you calculate the square of the positive number. The result is the same. If you want to do it with the calculator, the negative number must be enclosed between parentheses. (-x)^2=x^2.

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