What is the integral of 2^{9-x} ?

The integral of 2^{9-x} is -(2^{-x+9})/(ln(2))+C

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integral of 2^{9-x}

\int 2^{9 - x} d x

- \frac{2 ^{- x + 9}}{ln ( 2 )} + C

Solution steps

\int 2^{9 - x} d x

2^{9 - x} = 2^{9} \cdot 2^{- x}

= \int 2^{9} \cdot 2^{- x} d x

Take the constant out:

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

= 2^{9} \cdot \int 2^{- x} d x

Simplify

= 512 \cdot \int 2^{- x} d x

Apply u-substitution

= 512 \cdot \int - 2^{u} d u

Take the constant out:

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

= 512 (- \int 2^{u} d u)

\int a^{x} d x = \frac{a ^{x}}{ln a}

= 512 (- \frac{2 ^{u}}{ln ( 2 )})

Substitute back

u = - x

= 512 (- \frac{2 ^{- x}}{ln ( 2 )})

Simplify

512 (- \frac{2 ^{- x}}{ln ( 2 )}) : - \frac{2 ^{- x + 9}}{ln ( 2 )}

= - \frac{2 ^{- x + 9}}{ln ( 2 )}

Add a constant to the solution

= - \frac{2 ^{- x + 9}}{ln ( 2 )} + C

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What is the integral of 2^{9-x} ?
The integral of 2^{9-x} is -(2^{-x+9})/(ln(2))+C