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Popular Calculus >

integral of 4-e^{-x}

Solution

\int 4 - e^{- x} d x

Solution

4 x + e^{- x} + C

Solution steps

\int 4 - e^{- x} d x

Apply u-substitution

= \int - 4 + e^{u} d u

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= - \int 4 d u + \int e^{u} d u

\int 4 d u = 4 u

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

= - 4 u + e^{u}

Substitute back

u = - x

= - 4 (- x) + e^{- x}

Simplify

= 4 x + e^{- x}

Add a constant to the solution

= 4 x + e^{- x} + C

Graph

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Frequently Asked Questions (FAQ)

What is the integral of 4-e^{-x} ?
The integral of 4-e^{-x} is 4x+e^{-x}+C