Calculators Solving TI-89 Exact/Approx Homework Problem

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When using a TI-89 calculator to derive expressions, users may encounter unexpected decimal outputs instead of the expected algebraic results. In this case, deriving the function d(x^2 + 4x - 10, x) resulted in a decimal value of 5.27 instead of the correct derivative, 2x + 4. Changing the calculator's mode to exact, approximate, or auto did not resolve the issue. However, it was discovered that a value (0.635) was stored as the variable x, which affected the output. Clearing stored variables can help return to the correct algebraic form of the derivative.
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Homework Statement


Recently got a ti-89 and when I use it to derive for example d(x^2+4x-10, x)
I get a decimal, 5.27 instead of getting 2x+4.


The Attempt at a Solution


I tried changing the mode to exact, approx, and auto. All give the same answer.
I tried pressing the diamond button before ENTER, only in the exact mode it gave me a fraction.
 
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Press 2nd, F1 (to get to F6), then "Clear a-z".

Apparently, you have the value of .635 stored as x. :-p
 
Yay 2x+4!
Haha thanks.
 
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