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人気のある微分積分 >

integral from 0 to 2 of x^2e^{-9x}

解

\int_{0}^{2} x^{2} e^{- 9 x} d x

解

\frac{2 e ^{18} - 362}{729 e ^{18}}

+1

十進法表記

0.00274 \dots

解答ステップ

\int_{0}^{2} x^{2} e^{- 9 x} d x

u置換積分法を適用する

= \int_{0}^{- 18} - \frac{e ^{u} u ^{2}}{729} d u

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

= - \int_{- 18}^{0} - \frac{e ^{u} u ^{2}}{729} d u

定数を除く:

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

= - (- \frac{1}{729} \cdot \int_{- 18}^{0} e^{u} u^{2} d u)

部分積分を適用する

= - (- \frac{1}{729} [u^{2} e^{u} - \int 2 u e^{u} d u]_{- 18}^{0})

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

= - (- \frac{1}{729} [u^{2} e^{u} - 2 (e^{u} u - e^{u})]_{- 18}^{0})

簡素化

= \frac{1}{729} [e^{u} u^{2} - 2 (e^{u} u - e^{u})]_{- 18}^{0}

限度を計算する:

2 - \frac{362}{e ^{18}}

= \frac{1}{729} (2 - \frac{362}{e ^{18}})

簡素化

= \frac{2 e ^{18} - 362}{729 e ^{18}}

グラフ

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