Stuck on simple derivative, u(t)*t*e^(-5t), urnt?

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SUMMARY

The discussion revolves around the differentiation of the function u(t)*t*e^(-5t). The user expresses confusion but ultimately clarifies their understanding by applying the chain rule correctly. The derivative is computed as follows: for the function t*e^(-5t), the derivative is e^(-5t) + t*(-5)e^(-5t). The user successfully navigates through the differentiation process with the help of the chain rule and product rule.

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mr_coffee
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Hello eveyrone, I think my brain just shut down, I'm confused on how i would take the derivative of this function i have circled below:
http://img100.imageshack.us/img100/1671/lastscan2vi.jpg

I know the chain rule, like if it was
t*e^(-5t) = e^(-5t) + t*(-5)e^(-5t)
 
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[tex](u_2 t e^{-7t})' = u_2' t e^{-7t} + u_2 (e^{-7t} + t (-7)e^{-7t})[/tex]
 
Ahh thank u! I c it now! :biggrin:
 

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