What is the integral from 0 to 3 of te^{-0.4t} ?

The integral from 0 to 3 of te^{-0.4t} is 2.10857…

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integral from 0 to 3 of te^{-0.4t}

\int_{0}^{3} t e^{- 0.4 t} d t

2.10857 \dots

Solution steps

\int_{0}^{3} t e^{- 0.4 t} d t

Apply u-substitution

: \int_{0}^{- 1.2} \frac{5 e ^{u} u}{0.8} d u

= \int_{0}^{- 1.2} \frac{5 e ^{u} u}{0.8} d u

\int_{a}^{b} f (x) d x = - \int_{b}^{a} f (x) d x, a < b

= - \int_{- 1.2}^{0} \frac{5 e ^{u} u}{0.8} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - \frac{5}{0.8} \cdot \int_{- 1.2}^{0} e^{u} u d u

Simplify

= - 6.25 \cdot \int_{- 1.2}^{0} e^{u} u d u

Apply Integration By Parts

: [e^{u} u - \int e^{u} d u]_{- 1.2}^{0}

= - 6.25 [e^{u} u - \int e^{u} d u]_{- 1.2}^{0}

\int e^{u} d u = e^{u}

= - 6.25 [e^{u} u - e^{u}]_{- 1.2}^{0}

Compute the boundaries:

- 0.33737 \dots

= - 6.25 (- 0.33737 \dots)

Simplify

= 2.10857 \dots

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What is the integral from 0 to 3 of te^{-0.4t} ?
The integral from 0 to 3 of te^{-0.4t} is 2.10857…