What Is the Best Way to Solve Integrals Involving Exponential Functions?

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Homework Help Overview

The discussion revolves around solving integrals that involve exponential functions, specifically focusing on the integral of the form \(\int \frac{dx}{e^x}\). Participants are exploring various methods and clarifying concepts related to differentiation and integration of exponential functions.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss using u-substitution and taking the denominator to the top for simplification. There are questions about the derivative of \(e^{-x}\) and the application of the chain rule.

Discussion Status

Some participants have provided guidance on the differentiation of exponential functions and the chain rule. There is acknowledgment of a mistake regarding the derivative, and a participant confirms the correctness of their answer after checking.

Contextual Notes

There appears to be some confusion regarding the application of the chain rule and the handling of negative signs in derivatives. Participants are reflecting on their understanding and previous knowledge.

Saladsamurai
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because I keep getting jammed up here,

Using u substitution

\int \frac{dx}{e^x} I don't see what else to let u equal besides e^x. ...
 
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Take the denominator to the top...
 
learningphysics said:
Take the denominator to the top...

I just got it I think...Like I said, somehow since last night I've lost brain cells! for some reason I wouldn't believe that d\dx [e^-x]=e^-x <---
that is correct though right?
what is the derivative of e^-x ?
 
Last edited:
Saladsamurai said:
I just got it I think...Like I said, somehow since last night I've lost brain cells! for some reason I wouldn't believe that d\dx [e^-x]=e^-x <---
that is correct though right?

almost. be careful about the '-'

You should use the chain rule: what is the derivative of e^(ax)
 
learningphysics said:
almost. be careful about the '-'

You should use the chain rule: what is the derivative of e^(ax)

is it ae^ax ?

so it should be -e^{-x}
 
Just checked the answer and it is right. Thanks. Strange that I forgot to chain rule.
 
Saladsamurai said:
Just checked the answer and it is right. Thanks. Strange that I forgot to chain rule.

no prob.
 

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