Solution of exponential equation

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Discussion Overview

The discussion revolves around the solution of the exponential equation βe^(x/β) - x = β + (A/B) and how it simplifies to x = √(2A/βB) under the condition that β is large. The focus includes the mathematical reasoning behind the expansion of the exponential function.

Discussion Character

  • Mathematical reasoning, Technical explanation

Main Points Raised

  • One participant questions how the equation simplifies to a specific solution when β is large.
  • Another participant suggests expanding e^{x/β} to the first three terms as a method to approach the problem.
  • A participant expresses gratitude for the help and seeks clarification on the logic behind using the first three terms of the expansion.
  • It is noted that since β is large compared to x, including only the first three terms of the expansion is justified, as higher-order terms would be negligible.
  • There is a suggestion that for a more accurate solution, additional terms in the expansion should be considered.

Areas of Agreement / Disagreement

Participants appear to agree on the approach of expanding the exponential function, but there is no consensus on the necessity of including more terms for accuracy.

Contextual Notes

The discussion does not resolve the implications of the expansion or the accuracy of the solution based on the number of terms included.

techiejan
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How does the given equation:
βe^(x/β)-x = β+(A/B)

solves to x = √(2A/βB) when β is large?
 
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Expand e[itex]^{\frac{x}{\beta}}[/itex] to the first three terms.
 
Thanks grzz, I solved it now. Can you please tell me the logic behind expanding the exponential to first three terms?
 
The expansion of e[itex]^{\frac{x}{\beta}}[/itex] consists of powers of [itex]\frac{x}{β}[/itex].

Since β is large (compared with x) then we can include only the first three terms of the expansion since the other terms would be very small and would not change the value of x.

Of course, if one wants a more accurate value of x, one must include more terms in the expansion.
 
Thanks grzz. This was very helpful.
 

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