What is the integral of (4-3x)^8 ?

The integral of (4-3x)^8 is -1/27 (4-3x)^9+C

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integral of (4-3x)^8

\int (4 - 3 x)^{8} d x

- \frac{1}{27} (4 - 3 x)^{9} + C

Solution steps

\int (4 - 3 x)^{8} d x

Apply u-substitution

: \int - \frac{u ^{8}}{3} d u

= \int - \frac{u ^{8}}{3} d u

Take the constant out:

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

= - \frac{1}{3} \cdot \int u^{8} d u

Apply the Power Rule

: \frac{u ^{9}}{9}

= - \frac{1}{3} \cdot \frac{u ^{9}}{9}

Substitute back

u = 4 - 3 x

= - \frac{1}{3} \cdot \frac{( 4 - 3 x ) ^{9}}{9}

Simplify

- \frac{1}{3} \cdot \frac{( 4 - 3 x ) ^{9}}{9} : - \frac{1}{27} (4 - 3 x)^{9}

= - \frac{1}{27} (4 - 3 x)^{9}

Add a constant to the solution

= - \frac{1}{27} (4 - 3 x)^{9} + C

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