What is the integral of x^5sqrt(x^3+8) ?

The integral of x^5sqrt(x^3+8) is 1/3 (2/5 (x^3+8)^{5/2}-16/3 (x^3+8)^{3/2})+C

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integral of x^5sqrt(x^3+8)

\int x^{5} x^{3} + 8 d x

\frac{1}{3} (\frac{2}{5} (x^{3} + 8)^{\frac{5}{2}} - \frac{16}{3} (x^{3} + 8)^{\frac{3}{2}}) + C

Solution steps

\int x^{5} x^{3} + 8 d x

Apply u-substitution

= \int \frac{( u - 8 ) u}{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) u d u

Expand

(u - 8) u : u^{\frac{3}{2}} - 8 u

= \frac{1}{3} \cdot \int u^{\frac{3}{2}} - 8 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

= \frac{1}{3} (\int u^{\frac{3}{2}} d u - \int 8 u d u)

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

\int 8 u d u = \frac{16}{3} u^{\frac{3}{2}}

= \frac{1}{3} (\frac{2}{5} u^{\frac{5}{2}} - \frac{16}{3} u^{\frac{3}{2}})

Substitute back

u = x^{3} + 8

= \frac{1}{3} (\frac{2}{5} (x^{3} + 8)^{\frac{5}{2}} - \frac{16}{3} (x^{3} + 8)^{\frac{3}{2}})

Add a constant to the solution

= \frac{1}{3} (\frac{2}{5} (x^{3} + 8)^{\frac{5}{2}} - \frac{16}{3} (x^{3} + 8)^{\frac{3}{2}}) + C

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What is the integral of x^5sqrt(x^3+8) ?
The integral of x^5sqrt(x^3+8) is 1/3 (2/5 (x^3+8)^{5/2}-16/3 (x^3+8)^{3/2})+C