Integrand size = 15, antiderivative size = 108 \[ \int x^{5/2} \sqrt {2+b x} \, dx=\frac {5 \sqrt {x} \sqrt {2+b x}}{8 b^3}-\frac {5 x^{3/2} \sqrt {2+b x}}{24 b^2}+\frac {x^{5/2} \sqrt {2+b x}}{12 b}+\frac {1}{4} x^{7/2} \sqrt {2+b x}-\frac {5 \text {arcsinh}\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}}\right )}{4 b^{7/2}} \]
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Time = 0.03 (sec) , antiderivative size = 108, normalized size of antiderivative = 1.00, number of steps used = 6, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {52, 56, 221} \[ \int x^{5/2} \sqrt {2+b x} \, dx=-\frac {5 \text {arcsinh}\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}}\right )}{4 b^{7/2}}+\frac {5 \sqrt {x} \sqrt {b x+2}}{8 b^3}-\frac {5 x^{3/2} \sqrt {b x+2}}{24 b^2}+\frac {1}{4} x^{7/2} \sqrt {b x+2}+\frac {x^{5/2} \sqrt {b x+2}}{12 b} \]
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Rule 52
Rule 56
Rule 221
Rubi steps \begin{align*} \text {integral}& = \frac {1}{4} x^{7/2} \sqrt {2+b x}+\frac {1}{4} \int \frac {x^{5/2}}{\sqrt {2+b x}} \, dx \\ & = \frac {x^{5/2} \sqrt {2+b x}}{12 b}+\frac {1}{4} x^{7/2} \sqrt {2+b x}-\frac {5 \int \frac {x^{3/2}}{\sqrt {2+b x}} \, dx}{12 b} \\ & = -\frac {5 x^{3/2} \sqrt {2+b x}}{24 b^2}+\frac {x^{5/2} \sqrt {2+b x}}{12 b}+\frac {1}{4} x^{7/2} \sqrt {2+b x}+\frac {5 \int \frac {\sqrt {x}}{\sqrt {2+b x}} \, dx}{8 b^2} \\ & = \frac {5 \sqrt {x} \sqrt {2+b x}}{8 b^3}-\frac {5 x^{3/2} \sqrt {2+b x}}{24 b^2}+\frac {x^{5/2} \sqrt {2+b x}}{12 b}+\frac {1}{4} x^{7/2} \sqrt {2+b x}-\frac {5 \int \frac {1}{\sqrt {x} \sqrt {2+b x}} \, dx}{8 b^3} \\ & = \frac {5 \sqrt {x} \sqrt {2+b x}}{8 b^3}-\frac {5 x^{3/2} \sqrt {2+b x}}{24 b^2}+\frac {x^{5/2} \sqrt {2+b x}}{12 b}+\frac {1}{4} x^{7/2} \sqrt {2+b x}-\frac {5 \text {Subst}\left (\int \frac {1}{\sqrt {2+b x^2}} \, dx,x,\sqrt {x}\right )}{4 b^3} \\ & = \frac {5 \sqrt {x} \sqrt {2+b x}}{8 b^3}-\frac {5 x^{3/2} \sqrt {2+b x}}{24 b^2}+\frac {x^{5/2} \sqrt {2+b x}}{12 b}+\frac {1}{4} x^{7/2} \sqrt {2+b x}-\frac {5 \sinh ^{-1}\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}}\right )}{4 b^{7/2}} \\ \end{align*}
Time = 0.28 (sec) , antiderivative size = 84, normalized size of antiderivative = 0.78 \[ \int x^{5/2} \sqrt {2+b x} \, dx=\frac {\sqrt {x} \sqrt {2+b x} \left (15-5 b x+2 b^2 x^2+6 b^3 x^3\right )}{24 b^3}+\frac {5 \text {arctanh}\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {2}-\sqrt {2+b x}}\right )}{2 b^{7/2}} \]
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Time = 0.10 (sec) , antiderivative size = 71, normalized size of antiderivative = 0.66
method | result | size |
meijerg | \(-\frac {8 \left (-\frac {\sqrt {\pi }\, \sqrt {x}\, \sqrt {2}\, \sqrt {b}\, \left (42 b^{3} x^{3}+14 b^{2} x^{2}-35 b x +105\right ) \sqrt {\frac {b x}{2}+1}}{1344}+\frac {5 \sqrt {\pi }\, \operatorname {arcsinh}\left (\frac {\sqrt {b}\, \sqrt {x}\, \sqrt {2}}{2}\right )}{32}\right )}{b^{\frac {7}{2}} \sqrt {\pi }}\) | \(71\) |
risch | \(\frac {\left (6 b^{3} x^{3}+2 b^{2} x^{2}-5 b x +15\right ) \sqrt {x}\, \sqrt {b x +2}}{24 b^{3}}-\frac {5 \ln \left (\frac {b x +1}{\sqrt {b}}+\sqrt {b \,x^{2}+2 x}\right ) \sqrt {x \left (b x +2\right )}}{8 b^{\frac {7}{2}} \sqrt {x}\, \sqrt {b x +2}}\) | \(85\) |
default | \(\frac {x^{\frac {5}{2}} \left (b x +2\right )^{\frac {3}{2}}}{4 b}-\frac {5 \left (\frac {x^{\frac {3}{2}} \left (b x +2\right )^{\frac {3}{2}}}{3 b}-\frac {\frac {\sqrt {x}\, \left (b x +2\right )^{\frac {3}{2}}}{2 b}-\frac {\sqrt {x}\, \sqrt {b x +2}+\frac {\sqrt {x \left (b x +2\right )}\, \ln \left (\frac {b x +1}{\sqrt {b}}+\sqrt {b \,x^{2}+2 x}\right )}{\sqrt {b x +2}\, \sqrt {x}\, \sqrt {b}}}{2 b}}{b}\right )}{4 b}\) | \(121\) |
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Time = 0.24 (sec) , antiderivative size = 140, normalized size of antiderivative = 1.30 \[ \int x^{5/2} \sqrt {2+b x} \, dx=\left [\frac {{\left (6 \, b^{4} x^{3} + 2 \, b^{3} x^{2} - 5 \, b^{2} x + 15 \, b\right )} \sqrt {b x + 2} \sqrt {x} + 15 \, \sqrt {b} \log \left (b x - \sqrt {b x + 2} \sqrt {b} \sqrt {x} + 1\right )}{24 \, b^{4}}, \frac {{\left (6 \, b^{4} x^{3} + 2 \, b^{3} x^{2} - 5 \, b^{2} x + 15 \, b\right )} \sqrt {b x + 2} \sqrt {x} + 30 \, \sqrt {-b} \arctan \left (\frac {\sqrt {b x + 2} \sqrt {-b}}{b \sqrt {x}}\right )}{24 \, b^{4}}\right ] \]
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Time = 26.37 (sec) , antiderivative size = 117, normalized size of antiderivative = 1.08 \[ \int x^{5/2} \sqrt {2+b x} \, dx=\frac {b x^{\frac {9}{2}}}{4 \sqrt {b x + 2}} + \frac {7 x^{\frac {7}{2}}}{12 \sqrt {b x + 2}} - \frac {x^{\frac {5}{2}}}{24 b \sqrt {b x + 2}} + \frac {5 x^{\frac {3}{2}}}{24 b^{2} \sqrt {b x + 2}} + \frac {5 \sqrt {x}}{4 b^{3} \sqrt {b x + 2}} - \frac {5 \operatorname {asinh}{\left (\frac {\sqrt {2} \sqrt {b} \sqrt {x}}{2} \right )}}{4 b^{\frac {7}{2}}} \]
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Leaf count of result is larger than twice the leaf count of optimal. 163 vs. \(2 (75) = 150\).
Time = 0.33 (sec) , antiderivative size = 163, normalized size of antiderivative = 1.51 \[ \int x^{5/2} \sqrt {2+b x} \, dx=\frac {\frac {15 \, \sqrt {b x + 2} b^{3}}{\sqrt {x}} + \frac {73 \, {\left (b x + 2\right )}^{\frac {3}{2}} b^{2}}{x^{\frac {3}{2}}} - \frac {55 \, {\left (b x + 2\right )}^{\frac {5}{2}} b}{x^{\frac {5}{2}}} + \frac {15 \, {\left (b x + 2\right )}^{\frac {7}{2}}}{x^{\frac {7}{2}}}}{12 \, {\left (b^{7} - \frac {4 \, {\left (b x + 2\right )} b^{6}}{x} + \frac {6 \, {\left (b x + 2\right )}^{2} b^{5}}{x^{2}} - \frac {4 \, {\left (b x + 2\right )}^{3} b^{4}}{x^{3}} + \frac {{\left (b x + 2\right )}^{4} b^{3}}{x^{4}}\right )}} + \frac {5 \, \log \left (-\frac {\sqrt {b} - \frac {\sqrt {b x + 2}}{\sqrt {x}}}{\sqrt {b} + \frac {\sqrt {b x + 2}}{\sqrt {x}}}\right )}{8 \, b^{\frac {7}{2}}} \]
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Leaf count of result is larger than twice the leaf count of optimal. 198 vs. \(2 (75) = 150\).
Time = 12.34 (sec) , antiderivative size = 198, normalized size of antiderivative = 1.83 \[ \int x^{5/2} \sqrt {2+b x} \, dx=\frac {\frac {{\left ({\left ({\left (b x + 2\right )} {\left (2 \, {\left (b x + 2\right )} {\left (\frac {3 \, {\left (b x + 2\right )}}{b^{3}} - \frac {25}{b^{3}}\right )} + \frac {163}{b^{3}}\right )} - \frac {279}{b^{3}}\right )} \sqrt {{\left (b x + 2\right )} b - 2 \, b} \sqrt {b x + 2} - \frac {210 \, \log \left ({\left | -\sqrt {b x + 2} \sqrt {b} + \sqrt {{\left (b x + 2\right )} b - 2 \, b} \right |}\right )}{b^{\frac {5}{2}}}\right )} {\left | b \right |}}{b} + \frac {8 \, {\left (\sqrt {{\left (b x + 2\right )} b - 2 \, b} \sqrt {b x + 2} {\left ({\left (b x + 2\right )} {\left (\frac {2 \, {\left (b x + 2\right )}}{b^{2}} - \frac {13}{b^{2}}\right )} + \frac {33}{b^{2}}\right )} + \frac {30 \, \log \left ({\left | -\sqrt {b x + 2} \sqrt {b} + \sqrt {{\left (b x + 2\right )} b - 2 \, b} \right |}\right )}{b^{\frac {3}{2}}}\right )} {\left | b \right |}}{b^{2}}}{24 \, b} \]
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Timed out. \[ \int x^{5/2} \sqrt {2+b x} \, dx=\int x^{5/2}\,\sqrt {b\,x+2} \,d x \]
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