What is the integral from 0 to 1 of 4xe^{-2x} ?

The integral from 0 to 1 of 4xe^{-2x} is 1-3/(e^2)

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integral from 0 to 1 of 4xe^{-2x}

\int_{0}^{1} 4 x e^{- 2 x} d x

1 - \frac{3}{e ^{2}}

Decimal

0.59399 \dots

Solution steps

\int_{0}^{1} 4 x e^{- 2 x} d x

Take the constant out:

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

= 4 \cdot \int_{0}^{1} x e^{- 2 x} d x

Apply u-substitution

: \int_{0}^{- 2} \frac{e ^{u} u}{4} d u

= 4 \cdot \int_{0}^{- 2} \frac{e ^{u} u}{4} d u

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

= 4 (- \int_{- 2}^{0} \frac{e ^{u} u}{4} d u)

Take the constant out:

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

= 4 (- \frac{1}{4} \cdot \int_{- 2}^{0} e^{u} u d u)

Apply Integration By Parts

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

= 4 (- \frac{1}{4} [e^{u} u - \int e^{u} d u]_{- 2}^{0})

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

= 4 (- \frac{1}{4} [e^{u} u - e^{u}]_{- 2}^{0})

Simplify

4 (- \frac{1}{4} [e^{u} u - e^{u}]_{- 2}^{0}) : - [e^{u} u - e^{u}]_{- 2}^{0}

= - [e^{u} u - e^{u}]_{- 2}^{0}

Compute the boundaries:

- 1 + \frac{3}{e ^{2}}

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

Simplify

= 1 - \frac{3}{e ^{2}}

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What is the integral from 0 to 1 of 4xe^{-2x} ?
The integral from 0 to 1 of 4xe^{-2x} is 1-3/(e^2)