Optimal. Leaf size=59 \[ \frac{2 a^2 \left (a+b x^3\right )^{3/2}}{9 b^3}+\frac{2 \left (a+b x^3\right )^{7/2}}{21 b^3}-\frac{4 a \left (a+b x^3\right )^{5/2}}{15 b^3} \]
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Rubi [A] time = 0.035611, antiderivative size = 59, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 2, integrand size = 15, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.133, Rules used = {266, 43} \[ \frac{2 a^2 \left (a+b x^3\right )^{3/2}}{9 b^3}+\frac{2 \left (a+b x^3\right )^{7/2}}{21 b^3}-\frac{4 a \left (a+b x^3\right )^{5/2}}{15 b^3} \]
Antiderivative was successfully verified.
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Rule 266
Rule 43
Rubi steps
\begin{align*} \int x^8 \sqrt{a+b x^3} \, dx &=\frac{1}{3} \operatorname{Subst}\left (\int x^2 \sqrt{a+b x} \, dx,x,x^3\right )\\ &=\frac{1}{3} \operatorname{Subst}\left (\int \left (\frac{a^2 \sqrt{a+b x}}{b^2}-\frac{2 a (a+b x)^{3/2}}{b^2}+\frac{(a+b x)^{5/2}}{b^2}\right ) \, dx,x,x^3\right )\\ &=\frac{2 a^2 \left (a+b x^3\right )^{3/2}}{9 b^3}-\frac{4 a \left (a+b x^3\right )^{5/2}}{15 b^3}+\frac{2 \left (a+b x^3\right )^{7/2}}{21 b^3}\\ \end{align*}
Mathematica [A] time = 0.0188507, size = 39, normalized size = 0.66 \[ \frac{2 \left (a+b x^3\right )^{3/2} \left (8 a^2-12 a b x^3+15 b^2 x^6\right )}{315 b^3} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.004, size = 36, normalized size = 0.6 \begin{align*}{\frac{30\,{b}^{2}{x}^{6}-24\,{x}^{3}ab+16\,{a}^{2}}{315\,{b}^{3}} \left ( b{x}^{3}+a \right ) ^{{\frac{3}{2}}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 0.976512, size = 63, normalized size = 1.07 \begin{align*} \frac{2 \,{\left (b x^{3} + a\right )}^{\frac{7}{2}}}{21 \, b^{3}} - \frac{4 \,{\left (b x^{3} + a\right )}^{\frac{5}{2}} a}{15 \, b^{3}} + \frac{2 \,{\left (b x^{3} + a\right )}^{\frac{3}{2}} a^{2}}{9 \, b^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.4712, size = 103, normalized size = 1.75 \begin{align*} \frac{2 \,{\left (15 \, b^{3} x^{9} + 3 \, a b^{2} x^{6} - 4 \, a^{2} b x^{3} + 8 \, a^{3}\right )} \sqrt{b x^{3} + a}}{315 \, b^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 1.71078, size = 90, normalized size = 1.53 \begin{align*} \begin{cases} \frac{16 a^{3} \sqrt{a + b x^{3}}}{315 b^{3}} - \frac{8 a^{2} x^{3} \sqrt{a + b x^{3}}}{315 b^{2}} + \frac{2 a x^{6} \sqrt{a + b x^{3}}}{105 b} + \frac{2 x^{9} \sqrt{a + b x^{3}}}{21} & \text{for}\: b \neq 0 \\\frac{\sqrt{a} x^{9}}{9} & \text{otherwise} \end{cases} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.09563, size = 58, normalized size = 0.98 \begin{align*} \frac{2 \,{\left (15 \,{\left (b x^{3} + a\right )}^{\frac{7}{2}} - 42 \,{\left (b x^{3} + a\right )}^{\frac{5}{2}} a + 35 \,{\left (b x^{3} + a\right )}^{\frac{3}{2}} a^{2}\right )}}{315 \, b^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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