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

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

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integral of 6xe^{6x}

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

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

Solution steps

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

Take the constant out:

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

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

Apply u-substitution

: \int \frac{e ^{u} u}{36} d u

= 6 \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

= 6 \cdot \frac{1}{36} \cdot \int e^{u} u d u

Apply Integration By Parts

: e^{u} u - \int e^{u} d u

= 6 \cdot \frac{1}{36} (e^{u} u - \int e^{u} d u)

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

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

Substitute back

u = 6 x

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

Simplify

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

= e^{6 x} x - \frac{1}{6} e^{6 x}

Add a constant to the solution

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

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