Integrand size = 10, antiderivative size = 59 \[ \int x^2 \log (b+a x) \, dx=-\frac {b^2 x}{3 a^2}+\frac {b x^2}{6 a}-\frac {x^3}{9}+\frac {b^3 \log (b+a x)}{3 a^3}+\frac {1}{3} x^3 \log (b+a x) \]
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Time = 0.02 (sec) , antiderivative size = 59, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {2442, 45} \[ \int x^2 \log (b+a x) \, dx=\frac {b^3 \log (a x+b)}{3 a^3}-\frac {b^2 x}{3 a^2}+\frac {1}{3} x^3 \log (a x+b)+\frac {b x^2}{6 a}-\frac {x^3}{9} \]
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Rule 45
Rule 2442
Rubi steps \begin{align*} \text {integral}& = \frac {1}{3} x^3 \log (b+a x)-\frac {1}{3} a \int \frac {x^3}{b+a x} \, dx \\ & = \frac {1}{3} x^3 \log (b+a x)-\frac {1}{3} a \int \left (\frac {b^2}{a^3}-\frac {b x}{a^2}+\frac {x^2}{a}-\frac {b^3}{a^3 (b+a x)}\right ) \, dx \\ & = -\frac {b^2 x}{3 a^2}+\frac {b x^2}{6 a}-\frac {x^3}{9}+\frac {b^3 \log (b+a x)}{3 a^3}+\frac {1}{3} x^3 \log (b+a x) \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 59, normalized size of antiderivative = 1.00 \[ \int x^2 \log (b+a x) \, dx=-\frac {b^2 x}{3 a^2}+\frac {b x^2}{6 a}-\frac {x^3}{9}+\frac {b^3 \log (b+a x)}{3 a^3}+\frac {1}{3} x^3 \log (b+a x) \]
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Time = 0.06 (sec) , antiderivative size = 50, normalized size of antiderivative = 0.85
method | result | size |
norman | \(-\frac {b^{2} x}{3 a^{2}}+\frac {b \,x^{2}}{6 a}-\frac {x^{3}}{9}+\frac {b^{3} \ln \left (a x +b \right )}{3 a^{3}}+\frac {x^{3} \ln \left (a x +b \right )}{3}\) | \(50\) |
risch | \(-\frac {b^{2} x}{3 a^{2}}+\frac {b \,x^{2}}{6 a}-\frac {x^{3}}{9}+\frac {b^{3} \ln \left (a x +b \right )}{3 a^{3}}+\frac {x^{3} \ln \left (a x +b \right )}{3}\) | \(50\) |
parts | \(\frac {x^{3} \ln \left (a x +b \right )}{3}-\frac {a \left (\frac {\frac {1}{3} a^{2} x^{3}-\frac {1}{2} a b \,x^{2}+b^{2} x}{a^{3}}-\frac {b^{3} \ln \left (a x +b \right )}{a^{4}}\right )}{3}\) | \(56\) |
parallelrisch | \(\frac {6 x^{3} \ln \left (a x +b \right ) a^{3}-2 a^{3} x^{3}+3 a^{2} b \,x^{2}-6 a \,b^{2} x +6 b^{3} \ln \left (a x +b \right )+6 b^{3}}{18 a^{3}}\) | \(61\) |
derivativedivides | \(\frac {b^{2} \left (\ln \left (a x +b \right ) \left (a x +b \right )-a x -b \right )-2 b \left (\frac {\left (a x +b \right )^{2} \ln \left (a x +b \right )}{2}-\frac {\left (a x +b \right )^{2}}{4}\right )+\frac {\left (a x +b \right )^{3} \ln \left (a x +b \right )}{3}-\frac {\left (a x +b \right )^{3}}{9}}{a^{3}}\) | \(82\) |
default | \(\frac {b^{2} \left (\ln \left (a x +b \right ) \left (a x +b \right )-a x -b \right )-2 b \left (\frac {\left (a x +b \right )^{2} \ln \left (a x +b \right )}{2}-\frac {\left (a x +b \right )^{2}}{4}\right )+\frac {\left (a x +b \right )^{3} \ln \left (a x +b \right )}{3}-\frac {\left (a x +b \right )^{3}}{9}}{a^{3}}\) | \(82\) |
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Time = 0.24 (sec) , antiderivative size = 49, normalized size of antiderivative = 0.83 \[ \int x^2 \log (b+a x) \, dx=-\frac {2 \, a^{3} x^{3} - 3 \, a^{2} b x^{2} + 6 \, a b^{2} x - 6 \, {\left (a^{3} x^{3} + b^{3}\right )} \log \left (a x + b\right )}{18 \, a^{3}} \]
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Time = 0.10 (sec) , antiderivative size = 54, normalized size of antiderivative = 0.92 \[ \int x^2 \log (b+a x) \, dx=- a \left (\frac {x^{3}}{9 a} - \frac {b x^{2}}{6 a^{2}} + \frac {b^{2} x}{3 a^{3}} - \frac {b^{3} \log {\left (a x + b \right )}}{3 a^{4}}\right ) + \frac {x^{3} \log {\left (a x + b \right )}}{3} \]
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Time = 0.18 (sec) , antiderivative size = 57, normalized size of antiderivative = 0.97 \[ \int x^2 \log (b+a x) \, dx=\frac {1}{3} \, x^{3} \log \left (a x + b\right ) + \frac {1}{18} \, a {\left (\frac {6 \, b^{3} \log \left (a x + b\right )}{a^{4}} - \frac {2 \, a^{2} x^{3} - 3 \, a b x^{2} + 6 \, b^{2} x}{a^{3}}\right )} \]
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Time = 0.28 (sec) , antiderivative size = 94, normalized size of antiderivative = 1.59 \[ \int x^2 \log (b+a x) \, dx=\frac {{\left (a x + b\right )}^{3} \log \left (a x + b\right )}{3 \, a^{3}} - \frac {{\left (a x + b\right )}^{2} b \log \left (a x + b\right )}{a^{3}} + \frac {{\left (a x + b\right )} b^{2} \log \left (a x + b\right )}{a^{3}} - \frac {{\left (a x + b\right )}^{3}}{9 \, a^{3}} + \frac {{\left (a x + b\right )}^{2} b}{2 \, a^{3}} - \frac {{\left (a x + b\right )} b^{2}}{a^{3}} \]
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Time = 0.18 (sec) , antiderivative size = 75, normalized size of antiderivative = 1.27 \[ \int x^2 \log (b+a x) \, dx=\left \{\begin {array}{cl} \frac {x^3\,\left (\ln \left (a\,x\right )-\frac {1}{3}\right )}{3} & \text {\ if\ \ }b=0\\ \frac {\ln \left (b+a\,x\right )\,\left (x^3+\frac {b^3}{a^3}\right )}{3}-\frac {b^3\,\left (\frac {a^3\,x^3}{3\,b^3}-\frac {a^2\,x^2}{2\,b^2}+\frac {a\,x}{b}\right )}{3\,a^3} & \text {\ if\ \ }b\neq 0 \end {array}\right . \]
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