Optimal. Leaf size=46 \[ -\frac {b^2 \log (a x+b)}{2 a^2}+\frac {1}{2} x^2 \log (a x+b)+\frac {b x}{2 a}-\frac {x^2}{4} \]
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Rubi [A] time = 0.02, antiderivative size = 46, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.250, Rules used = {2395, 43} \[ -\frac {b^2 \log (a x+b)}{2 a^2}+\frac {1}{2} x^2 \log (a x+b)+\frac {b x}{2 a}-\frac {x^2}{4} \]
Antiderivative was successfully verified.
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Rule 43
Rule 2395
Rubi steps
\begin {align*} \int x \log (b+a x) \, dx &=\frac {1}{2} x^2 \log (b+a x)-\frac {1}{2} a \int \frac {x^2}{b+a x} \, dx\\ &=\frac {1}{2} x^2 \log (b+a x)-\frac {1}{2} a \int \left (-\frac {b}{a^2}+\frac {x}{a}+\frac {b^2}{a^2 (b+a x)}\right ) \, dx\\ &=\frac {b x}{2 a}-\frac {x^2}{4}-\frac {b^2 \log (b+a x)}{2 a^2}+\frac {1}{2} x^2 \log (b+a x)\\ \end {align*}
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Mathematica [A] time = 0.01, size = 46, normalized size = 1.00 \[ -\frac {b^2 \log (a x+b)}{2 a^2}+\frac {1}{2} x^2 \log (a x+b)+\frac {b x}{2 a}-\frac {x^2}{4} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.40, size = 39, normalized size = 0.85 \[ -\frac {a^{2} x^{2} - 2 \, a b x - 2 \, {\left (a^{2} x^{2} - b^{2}\right )} \log \left (a x + b\right )}{4 \, a^{2}} \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 1.32, size = 58, normalized size = 1.26 \[ \frac {{\left (a x + b\right )}^{2} \log \left (a x + b\right )}{2 \, a^{2}} - \frac {{\left (a x + b\right )} b \log \left (a x + b\right )}{a^{2}} - \frac {{\left (a x + b\right )}^{2}}{4 \, a^{2}} + \frac {{\left (a x + b\right )} b}{a^{2}} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.00, size = 47, normalized size = 1.02 \[ \frac {x^{2} \ln \left (a x +b \right )}{2}-\frac {x^{2}}{4}+\frac {b x}{2 a}-\frac {b^{2} \ln \left (a x +b \right )}{2 a^{2}}+\frac {3 b^{2}}{4 a^{2}} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 0.41, size = 44, normalized size = 0.96 \[ \frac {1}{2} \, x^{2} \log \left (a x + b\right ) - \frac {1}{4} \, a {\left (\frac {2 \, b^{2} \log \left (a x + b\right )}{a^{3}} + \frac {a x^{2} - 2 \, b x}{a^{2}}\right )} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 0.19, size = 66, normalized size = 1.43 \[ \left \{\begin {array}{cl} \frac {x^2\,\left (\ln \left (a\,x\right )-\frac {1}{2}\right )}{2} & \text {\ if\ \ }b=0\\ \frac {\ln \left (b+a\,x\right )\,\left (x^2-\frac {b^2}{a^2}\right )}{2}-\frac {b^2\,\left (\frac {a^2\,x^2}{2\,b^2}-\frac {a\,x}{b}\right )}{2\,a^2} & \text {\ if\ \ }b\neq 0 \end {array}\right . \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [A] time = 0.18, size = 42, normalized size = 0.91 \[ - a \left (\frac {x^{2}}{4 a} - \frac {b x}{2 a^{2}} + \frac {b^{2} \log {\left (a x + b \right )}}{2 a^{3}}\right ) + \frac {x^{2} \log {\left (a x + b \right )}}{2} \]
Verification of antiderivative is not currently implemented for this CAS.
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