What is the integral of x^3sqrt(x^2-8) ?

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

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integral of x^3sqrt(x^2-8)

\int x^{3} x^{2} - 8 d x

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

Solution steps

\int x^{3} x^{2} - 8 d x

Apply u-substitution

: \int (u^{2} + 8) u^{2} d u

= \int (u^{2} + 8) u^{2} d u

Expand

(u^{2} + 8) u^{2} : u^{4} + 8 u^{2}

= \int u^{4} + 8 u^{2} 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^{4} d u + \int 8 u^{2} d u

\int u^{4} d u = \frac{u ^{5}}{5}

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

= \frac{u ^{5}}{5} + \frac{8 u ^{3}}{3}

Substitute back

u = x^{2} - 8

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

Simplify

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

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

Add a constant to the solution

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

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