Optimal. Leaf size=134 \[ -\frac{\sqrt{\pi } b^2 e^{a+\frac{b^2}{4 c}} \text{Erf}\left (\frac{b-2 c x}{2 \sqrt{c}}\right )}{8 c^{5/2}}-\frac{\sqrt{\pi } e^{a+\frac{b^2}{4 c}} \text{Erf}\left (\frac{b-2 c x}{2 \sqrt{c}}\right )}{4 c^{3/2}}-\frac{b e^{a+b x-c x^2}}{4 c^2}-\frac{x e^{a+b x-c x^2}}{2 c} \]
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Rubi [A] time = 0.0821288, antiderivative size = 134, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 4, integrand size = 17, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.235, Rules used = {2241, 2240, 2234, 2205} \[ -\frac{\sqrt{\pi } b^2 e^{a+\frac{b^2}{4 c}} \text{Erf}\left (\frac{b-2 c x}{2 \sqrt{c}}\right )}{8 c^{5/2}}-\frac{\sqrt{\pi } e^{a+\frac{b^2}{4 c}} \text{Erf}\left (\frac{b-2 c x}{2 \sqrt{c}}\right )}{4 c^{3/2}}-\frac{b e^{a+b x-c x^2}}{4 c^2}-\frac{x e^{a+b x-c x^2}}{2 c} \]
Antiderivative was successfully verified.
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Rule 2241
Rule 2240
Rule 2234
Rule 2205
Rubi steps
\begin{align*} \int e^{a+b x-c x^2} x^2 \, dx &=-\frac{e^{a+b x-c x^2} x}{2 c}+\frac{\int e^{a+b x-c x^2} \, dx}{2 c}+\frac{b \int e^{a+b x-c x^2} x \, dx}{2 c}\\ &=-\frac{b e^{a+b x-c x^2}}{4 c^2}-\frac{e^{a+b x-c x^2} x}{2 c}+\frac{b^2 \int e^{a+b x-c x^2} \, dx}{4 c^2}+\frac{e^{a+\frac{b^2}{4 c}} \int e^{-\frac{(b-2 c x)^2}{4 c}} \, dx}{2 c}\\ &=-\frac{b e^{a+b x-c x^2}}{4 c^2}-\frac{e^{a+b x-c x^2} x}{2 c}-\frac{e^{a+\frac{b^2}{4 c}} \sqrt{\pi } \text{erf}\left (\frac{b-2 c x}{2 \sqrt{c}}\right )}{4 c^{3/2}}+\frac{\left (b^2 e^{a+\frac{b^2}{4 c}}\right ) \int e^{-\frac{(b-2 c x)^2}{4 c}} \, dx}{4 c^2}\\ &=-\frac{b e^{a+b x-c x^2}}{4 c^2}-\frac{e^{a+b x-c x^2} x}{2 c}-\frac{b^2 e^{a+\frac{b^2}{4 c}} \sqrt{\pi } \text{erf}\left (\frac{b-2 c x}{2 \sqrt{c}}\right )}{8 c^{5/2}}-\frac{e^{a+\frac{b^2}{4 c}} \sqrt{\pi } \text{erf}\left (\frac{b-2 c x}{2 \sqrt{c}}\right )}{4 c^{3/2}}\\ \end{align*}
Mathematica [A] time = 0.114031, size = 79, normalized size = 0.59 \[ \frac{e^a \left (\sqrt{\pi } \left (b^2+2 c\right ) e^{\frac{b^2}{4 c}} \text{Erf}\left (\frac{2 c x-b}{2 \sqrt{c}}\right )-2 \sqrt{c} e^{x (b-c x)} (b+2 c x)\right )}{8 c^{5/2}} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.004, size = 111, normalized size = 0.8 \begin{align*} -{\frac{{{\rm e}^{-c{x}^{2}+bx+a}}x}{2\,c}}+{\frac{b}{2\,c} \left ( -{\frac{{{\rm e}^{-c{x}^{2}+bx+a}}}{2\,c}}-{\frac{b\sqrt{\pi }}{4}{{\rm e}^{a+{\frac{{b}^{2}}{4\,c}}}}{\it Erf} \left ( -\sqrt{c}x+{\frac{b}{2}{\frac{1}{\sqrt{c}}}} \right ){c}^{-{\frac{3}{2}}}} \right ) }-{\frac{\sqrt{\pi }}{4}{{\rm e}^{a+{\frac{{b}^{2}}{4\,c}}}}{\it Erf} \left ( -\sqrt{c}x+{\frac{b}{2}{\frac{1}{\sqrt{c}}}} \right ){c}^{-{\frac{3}{2}}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.16079, size = 204, normalized size = 1.52 \begin{align*} -\frac{{\left (\frac{\sqrt{\pi }{\left (2 \, c x - b\right )} b^{2}{\left (\operatorname{erf}\left (\frac{1}{2} \, \sqrt{\frac{{\left (2 \, c x - b\right )}^{2}}{c}}\right ) - 1\right )}}{\sqrt{\frac{{\left (2 \, c x - b\right )}^{2}}{c}} \left (-c\right )^{\frac{5}{2}}} - \frac{4 \, b c e^{\left (-\frac{{\left (2 \, c x - b\right )}^{2}}{4 \, c}\right )}}{\left (-c\right )^{\frac{5}{2}}} - \frac{4 \,{\left (2 \, c x - b\right )}^{3} \Gamma \left (\frac{3}{2}, \frac{{\left (2 \, c x - b\right )}^{2}}{4 \, c}\right )}{\left (\frac{{\left (2 \, c x - b\right )}^{2}}{c}\right )^{\frac{3}{2}} \left (-c\right )^{\frac{5}{2}}}\right )} e^{\left (a + \frac{b^{2}}{4 \, c}\right )}}{8 \, \sqrt{-c}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.53471, size = 181, normalized size = 1.35 \begin{align*} \frac{\sqrt{\pi }{\left (b^{2} + 2 \, c\right )} \sqrt{c} \operatorname{erf}\left (\frac{2 \, c x - b}{2 \, \sqrt{c}}\right ) e^{\left (\frac{b^{2} + 4 \, a c}{4 \, c}\right )} - 2 \,{\left (2 \, c^{2} x + b c\right )} e^{\left (-c x^{2} + b x + a\right )}}{8 \, c^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F] time = 0., size = 0, normalized size = 0. \begin{align*} e^{a} \int x^{2} e^{b x} e^{- c x^{2}}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.26651, size = 108, normalized size = 0.81 \begin{align*} -\frac{\frac{\sqrt{\pi }{\left (b^{2} + 2 \, c\right )} \operatorname{erf}\left (-\frac{1}{2} \, \sqrt{c}{\left (2 \, x - \frac{b}{c}\right )}\right ) e^{\left (\frac{b^{2} + 4 \, a c}{4 \, c}\right )}}{\sqrt{c}} + 2 \,{\left (c{\left (2 \, x - \frac{b}{c}\right )} + 2 \, b\right )} e^{\left (-c x^{2} + b x + a\right )}}{8 \, c^{2}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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