What is the integral of e^{3x}e^{-5x} ?

The integral of e^{3x}e^{-5x} is -1/2 e^{-2x}+C

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integral of e^{3x}e^{-5x}

\int e^{3 x} e^{- 5 x} d x

- \frac{1}{2} e^{- 2 x} + C

Solution steps

\int e^{3 x} e^{- 5 x} d x

Simplify

e^{3 x} e^{- 5 x} : e^{- 2 x}

= \int e^{- 2 x} d x

Apply u-substitution

: \int - \frac{1}{2} e^{u} d u

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

Take the constant out:

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

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

Use the common integral:

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

= - \frac{1}{2} e^{u}

Substitute back

u = - 2 x

= - \frac{1}{2} e^{- 2 x}

Add a constant to the solution

= - \frac{1}{2} e^{- 2 x} + C

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What is the integral of e^{3x}e^{-5x} ?
The integral of e^{3x}e^{-5x} is -1/2 e^{-2x}+C