What is the integral of xe^{11x} ?

The integral of xe^{11x} is 1/121 (e^{11x}*11x-e^{11x})+C

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integral of xe^{11x}

\int x e^{11 x} d x

\frac{1}{121} (e^{11 x} \cdot 11 x - e^{11 x}) + C

Solution steps

\int x e^{11 x} d x

Apply u-substitution

= \int \frac{e ^{u} u}{121} d u

Take the constant out:

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

= \frac{1}{121} \cdot \int e^{u} u d u

Apply Integration By Parts

= \frac{1}{121} (e^{u} u - \int e^{u} d u)

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

= \frac{1}{121} (e^{u} u - e^{u})

Substitute back

u = 11 x

= \frac{1}{121} (e^{11 x} \cdot 11 x - e^{11 x})

Add a constant to the solution

= \frac{1}{121} (e^{11 x} \cdot 11 x - e^{11 x}) + C

What is the integral of xe^{11x} ?
The integral of xe^{11x} is 1/121 (e^{11x}*11x-e^{11x})+C