Optimal. Leaf size=60 \[ \frac{a^2 (a+b x)^{n+1}}{b^3 (n+1)}-\frac{2 a (a+b x)^{n+2}}{b^3 (n+2)}+\frac{(a+b x)^{n+3}}{b^3 (n+3)} \]
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Rubi [A] time = 0.0189535, antiderivative size = 60, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 1, integrand size = 11, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.091, Rules used = {43} \[ \frac{a^2 (a+b x)^{n+1}}{b^3 (n+1)}-\frac{2 a (a+b x)^{n+2}}{b^3 (n+2)}+\frac{(a+b x)^{n+3}}{b^3 (n+3)} \]
Antiderivative was successfully verified.
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Rule 43
Rubi steps
\begin{align*} \int x^2 (a+b x)^n \, dx &=\int \left (\frac{a^2 (a+b x)^n}{b^2}-\frac{2 a (a+b x)^{1+n}}{b^2}+\frac{(a+b x)^{2+n}}{b^2}\right ) \, dx\\ &=\frac{a^2 (a+b x)^{1+n}}{b^3 (1+n)}-\frac{2 a (a+b x)^{2+n}}{b^3 (2+n)}+\frac{(a+b x)^{3+n}}{b^3 (3+n)}\\ \end{align*}
Mathematica [A] time = 0.0252241, size = 57, normalized size = 0.95 \[ \frac{(a+b x)^{n+1} \left (2 a^2-2 a b (n+1) x+b^2 \left (n^2+3 n+2\right ) x^2\right )}{b^3 (n+1) (n+2) (n+3)} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.004, size = 73, normalized size = 1.2 \begin{align*}{\frac{ \left ( bx+a \right ) ^{1+n} \left ({b}^{2}{n}^{2}{x}^{2}+3\,{b}^{2}n{x}^{2}-2\,abnx+2\,{b}^{2}{x}^{2}-2\,abx+2\,{a}^{2} \right ) }{{b}^{3} \left ({n}^{3}+6\,{n}^{2}+11\,n+6 \right ) }} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.10318, size = 92, normalized size = 1.53 \begin{align*} \frac{{\left ({\left (n^{2} + 3 \, n + 2\right )} b^{3} x^{3} +{\left (n^{2} + n\right )} a b^{2} x^{2} - 2 \, a^{2} b n x + 2 \, a^{3}\right )}{\left (b x + a\right )}^{n}}{{\left (n^{3} + 6 \, n^{2} + 11 \, n + 6\right )} b^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.62979, size = 188, normalized size = 3.13 \begin{align*} -\frac{{\left (2 \, a^{2} b n x -{\left (b^{3} n^{2} + 3 \, b^{3} n + 2 \, b^{3}\right )} x^{3} - 2 \, a^{3} -{\left (a b^{2} n^{2} + a b^{2} n\right )} x^{2}\right )}{\left (b x + a\right )}^{n}}{b^{3} n^{3} + 6 \, b^{3} n^{2} + 11 \, b^{3} n + 6 \, b^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 1.05871, size = 597, normalized size = 9.95 \begin{align*} \begin{cases} \frac{a^{n} x^{3}}{3} & \text{for}\: b = 0 \\\frac{2 a^{2} \log{\left (\frac{a}{b} + x \right )}}{2 a^{2} b^{3} + 4 a b^{4} x + 2 b^{5} x^{2}} + \frac{a^{2}}{2 a^{2} b^{3} + 4 a b^{4} x + 2 b^{5} x^{2}} + \frac{4 a b x \log{\left (\frac{a}{b} + x \right )}}{2 a^{2} b^{3} + 4 a b^{4} x + 2 b^{5} x^{2}} + \frac{2 b^{2} x^{2} \log{\left (\frac{a}{b} + x \right )}}{2 a^{2} b^{3} + 4 a b^{4} x + 2 b^{5} x^{2}} - \frac{2 b^{2} x^{2}}{2 a^{2} b^{3} + 4 a b^{4} x + 2 b^{5} x^{2}} & \text{for}\: n = -3 \\- \frac{2 a^{2} \log{\left (\frac{a}{b} + x \right )}}{a b^{3} + b^{4} x} - \frac{2 a^{2}}{a b^{3} + b^{4} x} - \frac{2 a b x \log{\left (\frac{a}{b} + x \right )}}{a b^{3} + b^{4} x} + \frac{b^{2} x^{2}}{a b^{3} + b^{4} x} & \text{for}\: n = -2 \\\frac{a^{2} \log{\left (\frac{a}{b} + x \right )}}{b^{3}} - \frac{a x}{b^{2}} + \frac{x^{2}}{2 b} & \text{for}\: n = -1 \\\frac{2 a^{3} \left (a + b x\right )^{n}}{b^{3} n^{3} + 6 b^{3} n^{2} + 11 b^{3} n + 6 b^{3}} - \frac{2 a^{2} b n x \left (a + b x\right )^{n}}{b^{3} n^{3} + 6 b^{3} n^{2} + 11 b^{3} n + 6 b^{3}} + \frac{a b^{2} n^{2} x^{2} \left (a + b x\right )^{n}}{b^{3} n^{3} + 6 b^{3} n^{2} + 11 b^{3} n + 6 b^{3}} + \frac{a b^{2} n x^{2} \left (a + b x\right )^{n}}{b^{3} n^{3} + 6 b^{3} n^{2} + 11 b^{3} n + 6 b^{3}} + \frac{b^{3} n^{2} x^{3} \left (a + b x\right )^{n}}{b^{3} n^{3} + 6 b^{3} n^{2} + 11 b^{3} n + 6 b^{3}} + \frac{3 b^{3} n x^{3} \left (a + b x\right )^{n}}{b^{3} n^{3} + 6 b^{3} n^{2} + 11 b^{3} n + 6 b^{3}} + \frac{2 b^{3} x^{3} \left (a + b x\right )^{n}}{b^{3} n^{3} + 6 b^{3} n^{2} + 11 b^{3} n + 6 b^{3}} & \text{otherwise} \end{cases} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [B] time = 1.06967, size = 189, normalized size = 3.15 \begin{align*} \frac{{\left (b x + a\right )}^{n} b^{3} n^{2} x^{3} +{\left (b x + a\right )}^{n} a b^{2} n^{2} x^{2} + 3 \,{\left (b x + a\right )}^{n} b^{3} n x^{3} +{\left (b x + a\right )}^{n} a b^{2} n x^{2} + 2 \,{\left (b x + a\right )}^{n} b^{3} x^{3} - 2 \,{\left (b x + a\right )}^{n} a^{2} b n x + 2 \,{\left (b x + a\right )}^{n} a^{3}}{b^{3} n^{3} + 6 \, b^{3} n^{2} + 11 \, b^{3} n + 6 \, b^{3}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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