integral from 0 to 1 of x^2e^{-8x}

Lösung

\int_{0}^{1} x^{2} e^{- 8 x} d x

\frac{2 e ^{8} - 82}{512 e ^{8}}

Dezimale

0.00385 \dots

Schritte zur Lösung

\int_{0}^{1} x^{2} e^{- 8 x} d x

Wende U-Substitution an

= \int_{0}^{- 8} - \frac{e ^{u} u ^{2}}{512} d u

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

= - \int_{- 8}^{0} - \frac{e ^{u} u ^{2}}{512} d u

Entferne die Konstante:

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

= - (- \frac{1}{512} \cdot \int_{- 8}^{0} e^{u} u^{2} d u)

Wende die partielle Integration an

= - (- \frac{1}{512} [u^{2} e^{u} - \int 2 u e^{u} d u]_{- 8}^{0})

\int 2 u e^{u} d u = 2 (e^{u} u - e^{u})

= - (- \frac{1}{512} [u^{2} e^{u} - 2 (e^{u} u - e^{u})]_{- 8}^{0})

Vereinfache

= \frac{1}{512} [e^{u} u^{2} - 2 (e^{u} u - e^{u})]_{- 8}^{0}

Berechne die Grenzen:

2 - \frac{82}{e ^{8}}

= \frac{1}{512} (2 - \frac{82}{e ^{8}})

Vereinfache

= \frac{2 e ^{8} - 82}{512 e ^{8}}

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