What is the integral from 3 to infinity of te^{-st} ?

The integral from 3 to infinity of te^{-st} is -(-3e^{-3s}s-e^{-3s})/(s^2)

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integral from 3 to infinity of te^{-st}

\int_{3}^{\infty} t e^{- s t} d t

- \frac{- 3 e ^{- 3 s} s - e ^{- 3 s}}{s ^{2}}

Solution steps

\int_{3}^{\infty} t e^{- s t} d t

Compute the indefinite integral:

\int t e^{- s t} d t = \frac{1}{s ^{2}} (- s e^{- s t} t - e^{- s t}) + C

Compute the boundaries:

\int_{3}^{\infty} t e^{- s t} d t = 0 - \frac{- 3 e ^{- 3 s} s - e ^{- 3 s}}{s ^{2}}

= 0 - \frac{- 3 e ^{- 3 s} s - e ^{- 3 s}}{s ^{2}}

Simplify

= - \frac{- 3 e ^{- 3 s} s - e ^{- 3 s}}{s ^{2}}

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What is the integral from 3 to infinity of te^{-st} ?
The integral from 3 to infinity of te^{-st} is -(-3e^{-3s}s-e^{-3s})/(s^2)