What is the integral from 0 to 8 of x^2e^{-3x} ?

The integral from 0 to 8 of x^2e^{-3x} is (2e^{24}-626)/(27e^{24)}

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integral from 0 to 8 of x^2e^{-3x}

\int_{0}^{8} x^{2} e^{- 3 x} d x

\frac{2 e ^{24} - 626}{27 e ^{24}}

Decimal

0.07407 \dots

Solution steps

\int_{0}^{8} x^{2} e^{- 3 x} d x

Apply u-substitution

: \int_{0}^{- 24} - \frac{e ^{u} u ^{2}}{27} d u

= \int_{0}^{- 24} - \frac{e ^{u} u ^{2}}{27} d u

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

= - \int_{- 24}^{0} - \frac{e ^{u} u ^{2}}{27} d u

Take the constant out:

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

= - (- \frac{1}{27} \cdot \int_{- 24}^{0} e^{u} u^{2} d u)

Apply Integration By Parts

: [u^{2} e^{u} - \int 2 u e^{u} d u]_{- 24}^{0}

= - (- \frac{1}{27} [u^{2} e^{u} - \int 2 u e^{u} d u]_{- 24}^{0})

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

= - (- \frac{1}{27} [u^{2} e^{u} - 2 (e^{u} u - e^{u})]_{- 24}^{0})

Simplify

= \frac{1}{27} [e^{u} u^{2} - 2 (e^{u} u - e^{u})]_{- 24}^{0}

Compute the boundaries:

2 - \frac{626}{e ^{24}}

= \frac{1}{27} (2 - \frac{626}{e ^{24}})

Simplify

= \frac{2 e ^{24} - 626}{27 e ^{24}}

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What is the integral from 0 to 8 of x^2e^{-3x} ?
The integral from 0 to 8 of x^2e^{-3x} is (2e^{24}-626)/(27e^{24)}