Optimal. Leaf size=93 \[ -\frac{b^2 x \sqrt{a+\frac{b}{x}}}{8 a^2}+\frac{b^3 \tanh ^{-1}\left (\frac{\sqrt{a+\frac{b}{x}}}{\sqrt{a}}\right )}{8 a^{5/2}}+\frac{b x^2 \sqrt{a+\frac{b}{x}}}{12 a}+\frac{1}{3} x^3 \sqrt{a+\frac{b}{x}} \]
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Rubi [A] time = 0.0393377, antiderivative size = 93, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 5, integrand size = 15, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.333, Rules used = {266, 47, 51, 63, 208} \[ -\frac{b^2 x \sqrt{a+\frac{b}{x}}}{8 a^2}+\frac{b^3 \tanh ^{-1}\left (\frac{\sqrt{a+\frac{b}{x}}}{\sqrt{a}}\right )}{8 a^{5/2}}+\frac{b x^2 \sqrt{a+\frac{b}{x}}}{12 a}+\frac{1}{3} x^3 \sqrt{a+\frac{b}{x}} \]
Antiderivative was successfully verified.
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Rule 266
Rule 47
Rule 51
Rule 63
Rule 208
Rubi steps
\begin{align*} \int \sqrt{a+\frac{b}{x}} x^2 \, dx &=-\operatorname{Subst}\left (\int \frac{\sqrt{a+b x}}{x^4} \, dx,x,\frac{1}{x}\right )\\ &=\frac{1}{3} \sqrt{a+\frac{b}{x}} x^3-\frac{1}{6} b \operatorname{Subst}\left (\int \frac{1}{x^3 \sqrt{a+b x}} \, dx,x,\frac{1}{x}\right )\\ &=\frac{b \sqrt{a+\frac{b}{x}} x^2}{12 a}+\frac{1}{3} \sqrt{a+\frac{b}{x}} x^3+\frac{b^2 \operatorname{Subst}\left (\int \frac{1}{x^2 \sqrt{a+b x}} \, dx,x,\frac{1}{x}\right )}{8 a}\\ &=-\frac{b^2 \sqrt{a+\frac{b}{x}} x}{8 a^2}+\frac{b \sqrt{a+\frac{b}{x}} x^2}{12 a}+\frac{1}{3} \sqrt{a+\frac{b}{x}} x^3-\frac{b^3 \operatorname{Subst}\left (\int \frac{1}{x \sqrt{a+b x}} \, dx,x,\frac{1}{x}\right )}{16 a^2}\\ &=-\frac{b^2 \sqrt{a+\frac{b}{x}} x}{8 a^2}+\frac{b \sqrt{a+\frac{b}{x}} x^2}{12 a}+\frac{1}{3} \sqrt{a+\frac{b}{x}} x^3-\frac{b^2 \operatorname{Subst}\left (\int \frac{1}{-\frac{a}{b}+\frac{x^2}{b}} \, dx,x,\sqrt{a+\frac{b}{x}}\right )}{8 a^2}\\ &=-\frac{b^2 \sqrt{a+\frac{b}{x}} x}{8 a^2}+\frac{b \sqrt{a+\frac{b}{x}} x^2}{12 a}+\frac{1}{3} \sqrt{a+\frac{b}{x}} x^3+\frac{b^3 \tanh ^{-1}\left (\frac{\sqrt{a+\frac{b}{x}}}{\sqrt{a}}\right )}{8 a^{5/2}}\\ \end{align*}
Mathematica [C] time = 0.011731, size = 39, normalized size = 0.42 \[ -\frac{2 b^3 \left (a+\frac{b}{x}\right )^{3/2} \, _2F_1\left (\frac{3}{2},4;\frac{5}{2};\frac{b}{a x}+1\right )}{3 a^4} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.007, size = 115, normalized size = 1.2 \begin{align*}{\frac{x}{48}\sqrt{{\frac{ax+b}{x}}} \left ( 16\, \left ( a{x}^{2}+bx \right ) ^{3/2}{a}^{5/2}-12\,\sqrt{a{x}^{2}+bx}{a}^{5/2}xb-6\,\sqrt{a{x}^{2}+bx}{a}^{3/2}{b}^{2}+3\,\ln \left ( 1/2\,{\frac{2\,\sqrt{a{x}^{2}+bx}\sqrt{a}+2\,ax+b}{\sqrt{a}}} \right ) a{b}^{3} \right ){\frac{1}{\sqrt{ \left ( ax+b \right ) x}}}{a}^{-{\frac{7}{2}}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F(-2)] time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: ValueError} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.76973, size = 351, normalized size = 3.77 \begin{align*} \left [\frac{3 \, \sqrt{a} b^{3} \log \left (2 \, a x + 2 \, \sqrt{a} x \sqrt{\frac{a x + b}{x}} + b\right ) + 2 \,{\left (8 \, a^{3} x^{3} + 2 \, a^{2} b x^{2} - 3 \, a b^{2} x\right )} \sqrt{\frac{a x + b}{x}}}{48 \, a^{3}}, -\frac{3 \, \sqrt{-a} b^{3} \arctan \left (\frac{\sqrt{-a} \sqrt{\frac{a x + b}{x}}}{a}\right ) -{\left (8 \, a^{3} x^{3} + 2 \, a^{2} b x^{2} - 3 \, a b^{2} x\right )} \sqrt{\frac{a x + b}{x}}}{24 \, a^{3}}\right ] \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 7.32848, size = 122, normalized size = 1.31 \begin{align*} \frac{a x^{\frac{7}{2}}}{3 \sqrt{b} \sqrt{\frac{a x}{b} + 1}} + \frac{5 \sqrt{b} x^{\frac{5}{2}}}{12 \sqrt{\frac{a x}{b} + 1}} - \frac{b^{\frac{3}{2}} x^{\frac{3}{2}}}{24 a \sqrt{\frac{a x}{b} + 1}} - \frac{b^{\frac{5}{2}} \sqrt{x}}{8 a^{2} \sqrt{\frac{a x}{b} + 1}} + \frac{b^{3} \operatorname{asinh}{\left (\frac{\sqrt{a} \sqrt{x}}{\sqrt{b}} \right )}}{8 a^{\frac{5}{2}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.17739, size = 127, normalized size = 1.37 \begin{align*} -\frac{b^{3} \log \left ({\left | -2 \,{\left (\sqrt{a} x - \sqrt{a x^{2} + b x}\right )} \sqrt{a} - b \right |}\right ) \mathrm{sgn}\left (x\right )}{16 \, a^{\frac{5}{2}}} + \frac{b^{3} \log \left ({\left | b \right |}\right ) \mathrm{sgn}\left (x\right )}{16 \, a^{\frac{5}{2}}} + \frac{1}{24} \, \sqrt{a x^{2} + b x}{\left (2 \,{\left (4 \, x \mathrm{sgn}\left (x\right ) + \frac{b \mathrm{sgn}\left (x\right )}{a}\right )} x - \frac{3 \, b^{2} \mathrm{sgn}\left (x\right )}{a^{2}}\right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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