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

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

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integral of e^{-x-2y}

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

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

Solution steps

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

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 = - x - 2 y

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

Add a constant to the solution

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

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