What is the integral of 18e^{3x} ?

The integral of 18e^{3x} is 6e^{3x}+C

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integral of 18e^{3x}

\int 18 e^{3 x} d x

6 e^{3 x} + C

Solution steps

\int 18 e^{3 x} d x

Take the constant out:

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

= 18 \cdot \int e^{3 x} d x

Apply u-substitution

= 18 \cdot \int e^{u} \frac{1}{3} d u

Take the constant out:

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

= 18 \cdot \frac{1}{3} \cdot \int e^{u} d u

Use the common integral:

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

= 18 \cdot \frac{1}{3} e^{u}

Substitute back

u = 3 x

= 18 \cdot \frac{1}{3} e^{3 x}

Simplify

18 \cdot \frac{1}{3} e^{3 x} : 6 e^{3 x}

= 6 e^{3 x}

Add a constant to the solution

= 6 e^{3 x} + C