What is the integral of (e^{-x})/(sqrt(x)) ?

The integral of (e^{-x})/(sqrt(x)) is sqrt(pi)\erf(sqrt(x))+C

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integral of (e^{-x})/(sqrt(x))

\int \frac{e ^{- x}}{x} d x

π erf (x) + C

Solution steps

\int \frac{e ^{- x}}{x} d x

Apply u-substitution

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

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

Take the constant out:

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

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

Use the nonelementary integral:

\int e^{- u^{2}} d u = \frac{π}{2} erf (u)

= 2 \cdot \frac{π}{2} erf (u)

Substitute back

u = x

= 2 \cdot \frac{π}{2} erf (x)

Simplify

2 \cdot \frac{π}{2} erf (x) : π erf (x)

= π erf (x)

Add a constant to the solution

= π erf (x) + C

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What is the integral of (e^{-x})/(sqrt(x)) ?
The integral of (e^{-x})/(sqrt(x)) is sqrt(pi)\erf(sqrt(x))+C