integral from 0 to 1.5 of 2xe^{-x^2}

Lösung

\int_{0}^{1.5} 2 x e^{- x^{2}} d x

0.89460 \dots

Schritte zur Lösung

\int_{0}^{1.5} 2 x e^{- x^{2}} d x

Entferne die Konstante:

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

= 2 \cdot \int_{0}^{1.5} x e^{- x^{2}} d x

Wende U-Substitution an

= 2 \cdot \int_{0}^{- 2.25} - \frac{e ^{u}}{2} d u

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

= 2 (- \int_{- 2.25}^{0} - \frac{e ^{u}}{2} d u)

Entferne die Konstante:

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

= 2 (- (- \frac{1}{2} \cdot \int_{- 2.25}^{0} e^{u} d u))

Nutze das gemeinsame Integral :

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

= 2 (- (- \frac{1}{2} [e^{u}]_{- 2.25}^{0}))

Vereinfache

2 (- (- \frac{1}{2} [e^{u}]_{- 2.25}^{0})) : [e^{u}]_{- 2.25}^{0}

= [e^{u}]_{- 2.25}^{0}

Berechne die Grenzen:

0.89460 \dots

= 0.89460 \dots

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