What is the integral of 3e^{-2t} ?

The integral of 3e^{-2t} is -3/2 e^{-2t}+C

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integral of 3e^{-2t}

\int 3 e^{- 2 t} d t

- \frac{3}{2} e^{- 2 t} + C

Solution steps

\int 3 e^{- 2 t} d t

Take the constant out:

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

= 3 \cdot \int e^{- 2 t} d t

Apply u-substitution

= 3 \cdot \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

= 3 (- \frac{1}{2} \cdot \int e^{u} d u)

Use the common integral:

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

= 3 (- \frac{1}{2} e^{u})

Substitute back

u = - 2 t

= 3 (- \frac{1}{2} e^{- 2 t})

Simplify

3 (- \frac{1}{2} e^{- 2 t}) : - \frac{3}{2} e^{- 2 t}

= - \frac{3}{2} e^{- 2 t}

Add a constant to the solution

= - \frac{3}{2} e^{- 2 t} + C