What is the integral of 7xe^{9x^2} ?

The integral of 7xe^{9x^2} is 7/18 e^{9x^2}+C

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integral of 7xe^{9x^2}

\int 7 x e^{9 x^{2}} d x

\frac{7}{18} e^{9 x^{2}} + C

Solution steps

\int 7 x e^{9 x^{2}} 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^{9 x^{2}} d x

Apply u-substitution

= 7 \cdot \int \frac{e ^{u}}{18} d u

Take the constant out:

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

= 7 \cdot \frac{1}{18} \cdot \int e^{u} d u

Use the common integral:

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

= 7 \cdot \frac{1}{18} e^{u}

Substitute back

u = 9 x^{2}

= 7 \cdot \frac{1}{18} e^{9 x^{2}}

Simplify

7 \cdot \frac{1}{18} e^{9 x^{2}} : \frac{7}{18} e^{9 x^{2}}

= \frac{7}{18} e^{9 x^{2}}

Add a constant to the solution

= \frac{7}{18} e^{9 x^{2}} + C

What is the integral of 7xe^{9x^2} ?
The integral of 7xe^{9x^2} is 7/18 e^{9x^2}+C