integral from 0 to 1 of 3xe^{-x^2}

Lösung

\int_{0}^{1} 3 x e^{- x^{2}} d x

\frac{3 ( e - 1 )}{2 e}

Dezimale

0.94818 \dots

Schritte zur Lösung

\int_{0}^{1} 3 x e^{- x^{2}} d x

Entferne die Konstante:

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

= 3 \cdot \int_{0}^{1} x e^{- x^{2}} d x

Wende U-Substitution an

= 3 \cdot \int_{0}^{- 1} - \frac{e ^{u}}{2} d u

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

= 3 (- \int_{- 1}^{0} - \frac{e ^{u}}{2} d u)

Entferne die Konstante:

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

= 3 (- (- \frac{1}{2} \cdot \int_{- 1}^{0} e^{u} d u))

Nutze das gemeinsame Integral :

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

= 3 (- (- \frac{1}{2} [e^{u}]_{- 1}^{0}))

Vereinfache

3 (- (- \frac{1}{2} [e^{u}]_{- 1}^{0})) : \frac{3}{2} [e^{u}]_{- 1}^{0}

= \frac{3}{2} [e^{u}]_{- 1}^{0}

Berechne die Grenzen:

1 - \frac{1}{e}

= \frac{3}{2} (1 - \frac{1}{e})

Vereinfache

= \frac{3 ( e - 1 )}{2 e}

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