Laplace Transformation Convolution Integral

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SUMMARY

The discussion focuses on finding the Laplace transformation of a function expressed as Y(s) = g(t)/(s+2)^2 + 9/(s+2)^2. The correct solution is y(t) = 2e^-2t + te^-2t + ∫(t-τ)e^-2(t-τ) g(τ) dτ. Participants emphasize the importance of correctly combining terms in the Y(s) equation and using Laplace transformation tables effectively. The need for clarity in variable definitions, particularly distinguishing between G(s) and Y(s), is also highlighted.

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bmb2009
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Homework Statement



I need to find the laplace transformation of the following function (and it's ok to leave it expressed as an integral). After doing the initial steps and algebra I got

Y(s)= g(t)/(s+2)^2 + 7(1/(s+2)^2)+ 2(1/(s+2)^2)

the answer is y(t)=2e^-2t +te^-2t +∫(t-τ)e^-2(t-τ) g(τ) dτ

We are allowed to use laplace transformation tables but what I don't understand is how to factor the terms in the Y(s) equation into a form which correlates in the base transformations. Any help would be great. Thanks



Homework Equations





The Attempt at a Solution

 
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bmb2009 said:

Homework Statement



I need to find the laplace transformation of the following function (and it's ok to leave it expressed as an integral). After doing the initial steps and algebra I got

Y(s)= g(t)/(s+2)^2 + 7(1/(s+2)^2)+ 2(1/(s+2)^2)

the answer is y(t)=2e^-2t +te^-2t +∫(t-τ)e^-2(t-τ) g(τ) dτ

Why is there a ##t## variable in your expression for ##Y(s)##?
 
LCKurtz said:
Why is there a ##t## variable in your expression for ##Y(s)##?

My bad it's G(s) which is not explicitly defined
 
bmb2009 said:
Y(s)= g(t)/(s+2)^2 + 7(1/(s+2)^2)+ 2(1/(s+2)^2)
Is there some reason you didn't combine the last two terms into 9/(s+2)2?

the answer is y(t)=2e^-2t +te^-2t +∫(t-τ)e^-2(t-τ) g(τ) dτ
If this is the answer, you need to recheck your earlier work for errors.
 

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