What is the integral of 3xe^{-5x} ?

The integral of 3xe^{-5x} is 3/25 (-5e^{-5x}x-e^{-5x})+C

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integral of 3xe^{-5x}

\int 3 x e^{- 5 x} d x

\frac{3}{25} (- 5 e^{- 5 x} x - e^{- 5 x}) + C

Solution steps

\int 3 x e^{- 5 x} d x

Take the constant out:

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

= 3 \cdot \int x e^{- 5 x} d x

Apply u-substitution

= 3 \cdot \int \frac{e ^{u} u}{25} d u

Take the constant out:

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

= 3 \cdot \frac{1}{25} \cdot \int e^{u} u d u

Apply Integration By Parts

= 3 \cdot \frac{1}{25} (e^{u} u - \int e^{u} d u)

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

= 3 \cdot \frac{1}{25} (e^{u} u - e^{u})

Substitute back

u = - 5 x

= 3 \cdot \frac{1}{25} (e^{- 5 x} (- 5 x) - e^{- 5 x})

Simplify

3 \cdot \frac{1}{25} (e^{- 5 x} (- 5 x) - e^{- 5 x}) : \frac{3}{25} (- 5 e^{- 5 x} x - e^{- 5 x})

= \frac{3}{25} (- 5 e^{- 5 x} x - e^{- 5 x})

Add a constant to the solution

= \frac{3}{25} (- 5 e^{- 5 x} x - e^{- 5 x}) + C

What is the integral of 3xe^{-5x} ?
The integral of 3xe^{-5x} is 3/25 (-5e^{-5x}x-e^{-5x})+C