What is the integral of e^{x/9} ?

The integral of e^{x/9} is 9e^{x/9}+C

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integral of e^{x/9}

\int e^{\frac{x}{9}} d x

9 e^{\frac{x}{9}} + C

Solution steps

\int e^{\frac{x}{9}} d x

Apply u-substitution

: \int e^{u} \cdot 9 d u

= \int e^{u} \cdot 9 d u

Take the constant out:

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

= 9 \cdot \int e^{u} d u

Use the common integral:

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

= 9 e^{u}

Substitute back

u = \frac{x}{9}

= 9 e^{\frac{x}{9}}

Add a constant to the solution

= 9 e^{\frac{x}{9}} + C

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