What is the integral of e^{7x}x ?

The integral of e^{7x}x is 1/49 (e^{7x}*7x-e^{7x})+C

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integral of e^{7x}x

\int e^{7 x} x d x

\frac{1}{49} (e^{7 x} \cdot 7 x - e^{7 x}) + C

Solution steps

\int e^{7 x} x d x

Apply u-substitution

: \int \frac{e ^{u} u}{49} d u

= \int \frac{e ^{u} u}{49} d u

Take the constant out:

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

= \frac{1}{49} \cdot \int e^{u} u d u

Apply Integration By Parts

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

= \frac{1}{49} (e^{u} u - \int e^{u} d u)

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

= \frac{1}{49} (e^{u} u - e^{u})

Substitute back

u = 7 x

= \frac{1}{49} (e^{7 x} \cdot 7 x - e^{7 x})

Add a constant to the solution

= \frac{1}{49} (e^{7 x} \cdot 7 x - e^{7 x}) + C

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What is the integral of e^{7x}x ?
The integral of e^{7x}x is 1/49 (e^{7x}*7x-e^{7x})+C