What is the integral of xe^{-8x} ?

The integral of xe^{-8x} is 1/64 (-8e^{-8x}x-e^{-8x})+C

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integral of xe^{-8x}

\int x e^{- 8 x} d x

\frac{1}{64} (- 8 e^{- 8 x} x - e^{- 8 x}) + C

Solution steps

\int x e^{- 8 x} d x

Apply u-substitution

= \int \frac{e ^{u} u}{64} d u

Take the constant out:

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

= \frac{1}{64} \cdot \int e^{u} u d u

Apply Integration By Parts

= \frac{1}{64} (e^{u} u - \int e^{u} d u)

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

= \frac{1}{64} (e^{u} u - e^{u})

Substitute back

u = - 8 x

= \frac{1}{64} (e^{- 8 x} (- 8 x) - e^{- 8 x})

Simplify

= \frac{1}{64} (- 8 e^{- 8 x} x - e^{- 8 x})

Add a constant to the solution

= \frac{1}{64} (- 8 e^{- 8 x} x - e^{- 8 x}) + C

What is the integral of xe^{-8x} ?
The integral of xe^{-8x} is 1/64 (-8e^{-8x}x-e^{-8x})+C