Laplace transform with time shift

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SUMMARY

The discussion focuses on finding the Laplace transform of the function t*e-t*u(t-tau). The user expresses confusion regarding the time shift in the step function u(t-tau) and how it interacts with the rest of the expression. A hint is provided, suggesting a transformation of the expression into a more manageable form: te-t = (t-tau+tau)e-(t-tau+tau). This approach allows for the application of the Laplace transform rules effectively.

PREREQUISITES
  • Understanding of Laplace transforms and their properties
  • Familiarity with the unit step function u(t)
  • Knowledge of exponential functions and their transformations
  • Basic calculus skills for manipulating expressions
NEXT STEPS
  • Study the properties of the Laplace transform, particularly with time shifts
  • Learn about the unit step function and its role in Laplace transforms
  • Explore examples of Laplace transforms involving products of polynomials and exponentials
  • Practice manipulating expressions using the hint provided to simplify complex functions
USEFUL FOR

Students studying differential equations, engineers applying Laplace transforms in systems analysis, and anyone seeking to understand time-shift properties in Laplace transforms.

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Homework Statement



I need to find the Laplace transform of t*e-t*u(t-tau)

2. Homework Equations and attempt at solution

I know the general form of the transform, but my problem is in the time shift of the step function. If both parts of the expression were (t-tau), then I could just pull out an e(s*tau), but I have no idea what I'm supposed to do when one part has it and the other does not.

Can anyone help get me started?
 
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Hint:

[tex]te^{-t} = (t-\tau+\tau)e^{-(t-\tau+\tau)}[/tex]
 

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