What is the integral of e^{rx} ?

The integral of e^{rx} is 1/r e^{rx}+C

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integral of e^{rx}

\int e^{r x} d x

\frac{1}{r} e^{r x} + C

Solution steps

\int e^{r x} d x

Apply u-substitution

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

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

Take the constant out:

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

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

Use the common integral:

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

= \frac{1}{r} e^{u}

Substitute back

u = r x

= \frac{1}{r} e^{r x}

Add a constant to the solution

= \frac{1}{r} e^{r x} + C

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