Integrand size = 11, antiderivative size = 43 \[ \int \frac {(a+b x)^3}{x^8} \, dx=-\frac {a^3}{7 x^7}-\frac {a^2 b}{2 x^6}-\frac {3 a b^2}{5 x^5}-\frac {b^3}{4 x^4} \]
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Time = 0.01 (sec) , antiderivative size = 43, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 1, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.091, Rules used = {45} \[ \int \frac {(a+b x)^3}{x^8} \, dx=-\frac {a^3}{7 x^7}-\frac {a^2 b}{2 x^6}-\frac {3 a b^2}{5 x^5}-\frac {b^3}{4 x^4} \]
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Rule 45
Rubi steps \begin{align*} \text {integral}& = \int \left (\frac {a^3}{x^8}+\frac {3 a^2 b}{x^7}+\frac {3 a b^2}{x^6}+\frac {b^3}{x^5}\right ) \, dx \\ & = -\frac {a^3}{7 x^7}-\frac {a^2 b}{2 x^6}-\frac {3 a b^2}{5 x^5}-\frac {b^3}{4 x^4} \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 43, normalized size of antiderivative = 1.00 \[ \int \frac {(a+b x)^3}{x^8} \, dx=-\frac {a^3}{7 x^7}-\frac {a^2 b}{2 x^6}-\frac {3 a b^2}{5 x^5}-\frac {b^3}{4 x^4} \]
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Time = 0.17 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81
method | result | size |
norman | \(\frac {-\frac {1}{4} b^{3} x^{3}-\frac {3}{5} a \,b^{2} x^{2}-\frac {1}{2} a^{2} b x -\frac {1}{7} a^{3}}{x^{7}}\) | \(35\) |
risch | \(\frac {-\frac {1}{4} b^{3} x^{3}-\frac {3}{5} a \,b^{2} x^{2}-\frac {1}{2} a^{2} b x -\frac {1}{7} a^{3}}{x^{7}}\) | \(35\) |
gosper | \(-\frac {35 b^{3} x^{3}+84 a \,b^{2} x^{2}+70 a^{2} b x +20 a^{3}}{140 x^{7}}\) | \(36\) |
default | \(-\frac {a^{3}}{7 x^{7}}-\frac {a^{2} b}{2 x^{6}}-\frac {3 a \,b^{2}}{5 x^{5}}-\frac {b^{3}}{4 x^{4}}\) | \(36\) |
parallelrisch | \(\frac {-35 b^{3} x^{3}-84 a \,b^{2} x^{2}-70 a^{2} b x -20 a^{3}}{140 x^{7}}\) | \(36\) |
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Time = 0.21 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {(a+b x)^3}{x^8} \, dx=-\frac {35 \, b^{3} x^{3} + 84 \, a b^{2} x^{2} + 70 \, a^{2} b x + 20 \, a^{3}}{140 \, x^{7}} \]
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Time = 0.14 (sec) , antiderivative size = 37, normalized size of antiderivative = 0.86 \[ \int \frac {(a+b x)^3}{x^8} \, dx=\frac {- 20 a^{3} - 70 a^{2} b x - 84 a b^{2} x^{2} - 35 b^{3} x^{3}}{140 x^{7}} \]
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Time = 0.20 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {(a+b x)^3}{x^8} \, dx=-\frac {35 \, b^{3} x^{3} + 84 \, a b^{2} x^{2} + 70 \, a^{2} b x + 20 \, a^{3}}{140 \, x^{7}} \]
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Time = 0.29 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {(a+b x)^3}{x^8} \, dx=-\frac {35 \, b^{3} x^{3} + 84 \, a b^{2} x^{2} + 70 \, a^{2} b x + 20 \, a^{3}}{140 \, x^{7}} \]
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Time = 0.02 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.81 \[ \int \frac {(a+b x)^3}{x^8} \, dx=-\frac {\frac {a^3}{7}+\frac {a^2\,b\,x}{2}+\frac {3\,a\,b^2\,x^2}{5}+\frac {b^3\,x^3}{4}}{x^7} \]
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