What is the integral of 7xe^{5x} ?

The integral of 7xe^{5x} is 7/25 (5e^{5x}x-e^{5x})+C

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integral of 7xe^{5x}

\int 7 x e^{5 x} d x

\frac{7}{25} (5 e^{5 x} x - e^{5 x}) + C

Solution steps

\int 7 x e^{5 x} d x

Take the constant out:

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

= 7 \cdot \int x e^{5 x} d x

Apply u-substitution

= 7 \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

= 7 \cdot \frac{1}{25} \cdot \int e^{u} u d u

Apply Integration By Parts

= 7 \cdot \frac{1}{25} (e^{u} u - \int e^{u} d u)

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

= 7 \cdot \frac{1}{25} (e^{u} u - e^{u})

Substitute back

u = 5 x

= 7 \cdot \frac{1}{25} (e^{5 x} \cdot 5 x - e^{5 x})

Simplify

7 \cdot \frac{1}{25} (e^{5 x} \cdot 5 x - e^{5 x}) : \frac{7}{25} (5 e^{5 x} x - e^{5 x})

= \frac{7}{25} (5 e^{5 x} x - e^{5 x})

Add a constant to the solution

= \frac{7}{25} (5 e^{5 x} x - e^{5 x}) + C

What is the integral of 7xe^{5x} ?
The integral of 7xe^{5x} is 7/25 (5e^{5x}x-e^{5x})+C