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

The integral of x(x+4)^8 is ((x+4)^{10}}{10}-\frac{4(x+4)^9)/9+C

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integral of x(x+4)^8

\int x (x + 4)^{8} d x

\frac{( x + 4 ) ^{10}}{10} - \frac{4 ( x + 4 ) ^{9}}{9} + C

Solution steps

\int x (x + 4)^{8} d x

Apply u-substitution

: \int (u - 4) u^{8} d u

= \int (u - 4) u^{8} d u

Expand

(u - 4) u^{8} : u^{9} - 4 u^{8}

= \int u^{9} - 4 u^{8} 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 u^{9} d u - \int 4 u^{8} d u

\int u^{9} d u = \frac{u ^{10}}{10}

\int 4 u^{8} d u = \frac{4 u ^{9}}{9}

= \frac{u ^{10}}{10} - \frac{4 u ^{9}}{9}

Substitute back

u = x + 4

= \frac{( x + 4 ) ^{10}}{10} - \frac{4 ( x + 4 ) ^{9}}{9}

Add a constant to the solution

= \frac{( x + 4 ) ^{10}}{10} - \frac{4 ( x + 4 ) ^{9}}{9} + C

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What is the integral of x(x+4)^8 ?
The integral of x(x+4)^8 is ((x+4)^{10}}{10}-\frac{4(x+4)^9)/9+C