What is the integral of (x-x^3)/(sqrt(x)) ?

The integral of (x-x^3)/(sqrt(x)) is 2/3 x^{3/2}-2/7 x^{7/2}+C

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integral of (x-x^3)/(sqrt(x))

\int \frac{x - x ^{3}}{x} d x

\frac{2}{3} x^{\frac{3}{2}} - \frac{2}{7} x^{\frac{7}{2}} + C

Solution steps

\int \frac{x - x ^{3}}{x} d x

Simplify

\frac{x - x ^{3}}{x} : x (1 - x^{2})

= \int x (1 - x^{2}) d x

Expand

x (1 - x^{2}) : x - x^{\frac{5}{2}}

= \int x - x^{\frac{5}{2}} d x

Apply the Sum Rule:

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

= \int x d x - \int x^{\frac{5}{2}} d x

\int x d x = \frac{2}{3} x^{\frac{3}{2}}

\int x^{\frac{5}{2}} d x = \frac{2}{7} x^{\frac{7}{2}}

= \frac{2}{3} x^{\frac{3}{2}} - \frac{2}{7} x^{\frac{7}{2}}

Add a constant to the solution

= \frac{2}{3} x^{\frac{3}{2}} - \frac{2}{7} x^{\frac{7}{2}} + C

What is the integral of (x-x^3)/(sqrt(x)) ?
The integral of (x-x^3)/(sqrt(x)) is 2/3 x^{3/2}-2/7 x^{7/2}+C