What is the integral of 3e^{x^2}x ?

The integral of 3e^{x^2}x is 3/2 e^{x^2}+C

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integral of 3e^{x^2}x

\int 3 e^{x^{2}} x d x

\frac{3}{2} e^{x^{2}} + C

Solution steps

\int 3 e^{x^{2}} x d x

Take the constant out:

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

= 3 \cdot \int e^{x^{2}} x d x

Apply u-substitution

: \int \frac{e ^{u}}{2} d u

= 3 \cdot \int \frac{e ^{u}}{2} d u

Take the constant out:

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

= 3 \cdot \frac{1}{2} \cdot \int e^{u} d u

Use the common integral:

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

= 3 \cdot \frac{1}{2} e^{u}

Substitute back

u = x^{2}

= 3 \cdot \frac{1}{2} e^{x^{2}}

Simplify

3 \cdot \frac{1}{2} e^{x^{2}} : \frac{3}{2} e^{x^{2}}

= \frac{3}{2} e^{x^{2}}

Add a constant to the solution

= \frac{3}{2} e^{x^{2}} + C

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