What is the integral from 0 to 0.9 of e^{-x} ?

The integral from 0 to 0.9 of e^{-x} is 0.59343…

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integral from 0 to 0.9 of e^{-x}

\int_{0}^{0.9} e^{- x} d x

0.59343 \dots

Solution steps

\int_{0}^{0.9} e^{- x} d x

Apply u-substitution

: \int_{0}^{- 0.9} - e^{u} d u

= \int_{0}^{- 0.9} - e^{u} d u

\int_{a}^{b} f (x) d x = - \int_{b}^{a} f (x) d x, a < b

= - \int_{- 0.9}^{0} - e^{u} d u

Take the constant out:

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

= - (- \int_{- 0.9}^{0} e^{u} d u)

Use the common integral:

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

= - (- [e^{u}]_{- 0.9}^{0})

Simplify

= [e^{u}]_{- 0.9}^{0}

Compute the boundaries:

0.59343 \dots

= 0.59343 \dots

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What is the integral from 0 to 0.9 of e^{-x} ?
The integral from 0 to 0.9 of e^{-x} is 0.59343…