My calculator's integration seems wrong

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Discussion Overview

The discussion revolves around a discrepancy in the results of an integral calculation performed on a TI-nspire cx CAS calculator compared to the output from Wolfram Alpha. The integral in question involves the expression x² + xy/2, evaluated from 0 to x with respect to y. Participants explore potential reasons for the differing results.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant presents the integral and the result from their calculator, noting the difference from Wolfram Alpha's output.
  • Another participant questions whether the original input into the calculator was correct, suggesting that the placement of brackets may have affected the result.
  • A third participant reiterates the integral and result, suggesting that the calculator may have used an incorrect variable for integration.
  • Another participant proposes that the absence of a multiplication symbol in "xy" could lead the calculator to treat it as a constant, resulting in an unexpected integration outcome.
  • A participant expresses gratitude for the clarification provided regarding the potential issue with the calculator's interpretation of the expression.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact cause of the discrepancy, but there is agreement on the importance of correctly inputting the integral into the calculator. Multiple views on the potential reasons for the differing results are presented.

Contextual Notes

Limitations include the lack of clarity on the specific input used in the calculator and the assumptions made regarding the interpretation of the expression "xy".

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did you enter the right thing into your calculator with brackets in the right place, etc? I don't know how that y got left behind, you know your calculator better than I do.I got the same thing wolfram did.
 
Did you put a multiplication symbol, "*", in the middle of "xy"?. It seems that your calculator treated "xy" as the name of a single constant. Thus, your calculator integrated the constant "xy" and got y*xy, After evaluating at the limits, this becomes x*xy.
 
That's it! Thank you so much George.
 

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