Question about Texas Instruments TI-83 Plus Silver Edition Calculator
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?
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
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