What is the integral of x/(\sqrt[3]{x+3)} ?

The integral of x/(\sqrt[3]{x+3)} is 3/5 (x+3)^{5/3}-9/2 (x+3)^{2/3}+C

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integral of x/(\sqrt[3]{x+3)}

\int \frac{x}{3 x + 3} d x

\frac{3}{5} (x + 3)^{\frac{5}{3}} - \frac{9}{2} (x + 3)^{\frac{2}{3}} + C

Solution steps

\int \frac{x}{3 x + 3} d x

Apply u-substitution

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

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

Expand

\frac{u - 3}{3 u} : u^{\frac{2}{3}} - \frac{3}{3 u}

= \int u^{\frac{2}{3}} - \frac{3}{3 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 u^{\frac{2}{3}} d u - \int \frac{3}{3 u} d u

\int u^{\frac{2}{3}} d u = \frac{3}{5} u^{\frac{5}{3}}

\int \frac{3}{3 u} d u = \frac{9}{2} u^{\frac{2}{3}}

= \frac{3}{5} u^{\frac{5}{3}} - \frac{9}{2} u^{\frac{2}{3}}

Substitute back

u = x + 3

= \frac{3}{5} (x + 3)^{\frac{5}{3}} - \frac{9}{2} (x + 3)^{\frac{2}{3}}

Add a constant to the solution

= \frac{3}{5} (x + 3)^{\frac{5}{3}} - \frac{9}{2} (x + 3)^{\frac{2}{3}} + C

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What is the integral of x/(\sqrt[3]{x+3)} ?
The integral of x/(\sqrt[3]{x+3)} is 3/5 (x+3)^{5/3}-9/2 (x+3)^{2/3}+C