Inverse Laplace- Partial Fractions with exponential

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Homework Help Overview

The discussion revolves around finding the inverse Laplace transform of expressions that include exponential terms in the numerator and polynomial factors in the denominator, specifically focusing on the use of partial fractions.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the factorization of denominators and the application of partial fractions, questioning how to handle the exponential terms in the numerators. There are attempts to express the problem in a different form to facilitate the use of partial fractions.

Discussion Status

The discussion is ongoing, with participants sharing their attempts and expressing confusion about the integration of exponential functions with partial fractions. Some guidance has been offered regarding the manipulation of the expressions, but no consensus has been reached on a clear method.

Contextual Notes

Participants mention specific forms of the Laplace transform and express uncertainty about the implications of exponential components in the context of partial fractions. There is also a reference to potential issues with the standard approach to partial fractions in these cases.

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Homework Statement


[e^(-2s)] / (s^2+s-2)
Find the inverse Laplace transform.


Homework Equations





The Attempt at a Solution


I know that I can factor the denominator into (s+2)(s-1). Then I tried to use partial fractions to split up the denominator, but I don't know how to do that with an exponential on the top. Thanks for any help!
 
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just write it as exp(whatever)*(1/whatever). Then do partial fractions to get exp(whatever)*(?/a + ?/b). You will see that the exponential will be easy to 'invert' back into the time domain as it corresponds to unit step functions (i believe).
 
Im stuck in the same boat, but trying to get the partial fraction for "(e^[-s] -e^[-2s])/[(s^2)(s+1)]"

I wasn't too sure what EngageEngage meant.
 
i am having the same problems! never knew there was any issue with partial fractions involving exponential components.

my question was to get partial fraction from 3e^-2s/(s(s+5)), so i brought down the exponential function to get 3 different fractions with 1/e^2s, 1/s and 1/(s+5).

But it still doesn't work out.
 

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