Struggling with a Limit Calculation: Can You Help?

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Discussion Overview

The discussion revolves around a limit calculation involving the expression (2^x * (x + 1)) / (1 - 3^x). Participants explore methods to evaluate the limit as x approaches positive infinity, with some expressing difficulty in arriving at the solution.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant states they believe the limit is 0 but is struggling to demonstrate this through calculations.
  • Another participant suggests using the identity a^x = e^{\ln(a)x} as a potential approach.
  • A different participant acknowledges the identity but indicates they are still unable to refactor the expression to reach a conclusion of 0.
  • One participant proposes dividing both the numerator and denominator by 2^x as a method to simplify the limit calculation.
  • A later reply confirms the approach of dividing by 2^x and suggests further division by x, indicating progress in their understanding.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and methods for approaching the limit, but there is no consensus on the solution or the correctness of the approaches discussed.

Contextual Notes

Some participants may be missing assumptions or specific steps in their calculations, and the discussion does not resolve these uncertainties.

hugo.hribeiro
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I was reviewing my concepts of limits and didnt manage to solve this one. Probably is simple but I am not managing to get it.

Limit (2^x * (x + 1)) / (1 - 3^x)
+oo

i can see the answer is 0 but can't manage to get it...

Thx in advance,
 
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Recall that [itex]a^x=e^{\ln(a)x}[/itex].
 
yea, i remember that one...but still no luck in refactoring to a possible 0 result.
 
Divide top and bottom by 2^x.
 
Got it... divide by 2^x and then divid again by x.

Thx people ;)
 

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