What is the integral of 2xe^{-6x} ?

The integral of 2xe^{-6x} is 1/18 (-6e^{-6x}x-e^{-6x})+C

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integral of 2xe^{-6x}

\int 2 x e^{- 6 x} d x

\frac{1}{18} (- 6 e^{- 6 x} x - e^{- 6 x}) + C

Solution steps

\int 2 x e^{- 6 x} d x

Take the constant out:

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

= 2 \cdot \int x e^{- 6 x} d x

Apply u-substitution

= 2 \cdot \int \frac{e ^{u} u}{36} d u

Take the constant out:

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

= 2 \cdot \frac{1}{36} \cdot \int e^{u} u d u

Apply Integration By Parts

= 2 \cdot \frac{1}{36} (e^{u} u - \int e^{u} d u)

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

= 2 \cdot \frac{1}{36} (e^{u} u - e^{u})

Substitute back

u = - 6 x

= 2 \cdot \frac{1}{36} (e^{- 6 x} (- 6 x) - e^{- 6 x})

Simplify

2 \cdot \frac{1}{36} (e^{- 6 x} (- 6 x) - e^{- 6 x}) : \frac{1}{18} (- 6 e^{- 6 x} x - e^{- 6 x})

= \frac{1}{18} (- 6 e^{- 6 x} x - e^{- 6 x})

Add a constant to the solution

= \frac{1}{18} (- 6 e^{- 6 x} x - e^{- 6 x}) + C

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What is the integral of 2xe^{-6x} ?
The integral of 2xe^{-6x} is 1/18 (-6e^{-6x}x-e^{-6x})+C