\[ \int (e x)^{7/2} \sqrt {a+b x^3} \left (A+B x^3\right ) \, dx \]
Optimal antiderivative \[ \frac {B \left (e x \right )^{\frac {9}{2}} \left (b \,x^{3}+a \right )^{\frac {3}{2}}}{9 b e}-\frac {a^{2} \left (2 A b -a B \right ) e^{\frac {7}{2}} \arctanh \left (\frac {\left (e x \right )^{\frac {3}{2}} \sqrt {b}}{e^{\frac {3}{2}} \sqrt {b \,x^{3}+a}}\right )}{24 b^{\frac {5}{2}}}+\frac {a \left (2 A b -a B \right ) e^{2} \left (e x \right )^{\frac {3}{2}} \sqrt {b \,x^{3}+a}}{24 b^{2}}+\frac {\left (2 A b -a B \right ) \left (e x \right )^{\frac {9}{2}} \sqrt {b \,x^{3}+a}}{12 b e} \]
command
integrate((e*x)^(7/2)*(B*x^3+A)*(b*x^3+a)^(1/2),x, algorithm="maxima")
Maxima 5.46 SBCL 2.0.1.debian via sagemath 9.6 output
\[ \frac {1}{144} \, {\left (6 \, {\left (\frac {a^{2} \log \left (-\frac {\sqrt {b} - \frac {\sqrt {b x^{3} + a}}{x^{\frac {3}{2}}}}{\sqrt {b} + \frac {\sqrt {b x^{3} + a}}{x^{\frac {3}{2}}}}\right )}{b^{\frac {3}{2}}} + \frac {2 \, {\left (\frac {\sqrt {b x^{3} + a} a^{2} b}{x^{\frac {3}{2}}} + \frac {{\left (b x^{3} + a\right )}^{\frac {3}{2}} a^{2}}{x^{\frac {9}{2}}}\right )}}{b^{3} - \frac {2 \, {\left (b x^{3} + a\right )} b^{2}}{x^{3}} + \frac {{\left (b x^{3} + a\right )}^{2} b}{x^{6}}}\right )} A - {\left (\frac {3 \, a^{3} \log \left (-\frac {\sqrt {b} - \frac {\sqrt {b x^{3} + a}}{x^{\frac {3}{2}}}}{\sqrt {b} + \frac {\sqrt {b x^{3} + a}}{x^{\frac {3}{2}}}}\right )}{b^{\frac {5}{2}}} + \frac {2 \, {\left (\frac {3 \, \sqrt {b x^{3} + a} a^{3} b^{2}}{x^{\frac {3}{2}}} + \frac {8 \, {\left (b x^{3} + a\right )}^{\frac {3}{2}} a^{3} b}{x^{\frac {9}{2}}} - \frac {3 \, {\left (b x^{3} + a\right )}^{\frac {5}{2}} a^{3}}{x^{\frac {15}{2}}}\right )}}{b^{5} - \frac {3 \, {\left (b x^{3} + a\right )} b^{4}}{x^{3}} + \frac {3 \, {\left (b x^{3} + a\right )}^{2} b^{3}}{x^{6}} - \frac {{\left (b x^{3} + a\right )}^{3} b^{2}}{x^{9}}}\right )} B\right )} e^{\frac {7}{2}} \]
Maxima 5.44 via sagemath 9.3 output
\[ \int {\left (B x^{3} + A\right )} \sqrt {b x^{3} + a} \left (e x\right )^{\frac {7}{2}}\,{d x} \]________________________________________________________________________________________