3.159 \(\int \frac{x^3}{a+b x} \, dx\)

Optimal. Leaf size=44 \[ -\frac{a^3 \log (a+b x)}{b^4}+\frac{a^2 x}{b^3}-\frac{a x^2}{2 b^2}+\frac{x^3}{3 b} \]

[Out]

(a^2*x)/b^3 - (a*x^2)/(2*b^2) + x^3/(3*b) - (a^3*Log[a + b*x])/b^4

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Rubi [A]  time = 0.0442856, antiderivative size = 44, 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 \[ -\frac{a^3 \log (a+b x)}{b^4}+\frac{a^2 x}{b^3}-\frac{a x^2}{2 b^2}+\frac{x^3}{3 b} \]

Antiderivative was successfully verified.

[In]  Int[x^3/(a + b*x),x]

[Out]

(a^2*x)/b^3 - (a*x^2)/(2*b^2) + x^3/(3*b) - (a^3*Log[a + b*x])/b^4

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Rubi in Sympy [F]  time = 0., size = 0, normalized size = 0. \[ - \frac{a^{3} \log{\left (a + b x \right )}}{b^{4}} - \frac{a \int x\, dx}{b^{2}} + \frac{x^{3}}{3 b} + \frac{\int a^{2}\, dx}{b^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  rubi_integrate(x**3/(b*x+a),x)

[Out]

-a**3*log(a + b*x)/b**4 - a*Integral(x, x)/b**2 + x**3/(3*b) + Integral(a**2, x)
/b**3

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Mathematica [A]  time = 0.00502725, size = 44, normalized size = 1. \[ -\frac{a^3 \log (a+b x)}{b^4}+\frac{a^2 x}{b^3}-\frac{a x^2}{2 b^2}+\frac{x^3}{3 b} \]

Antiderivative was successfully verified.

[In]  Integrate[x^3/(a + b*x),x]

[Out]

(a^2*x)/b^3 - (a*x^2)/(2*b^2) + x^3/(3*b) - (a^3*Log[a + b*x])/b^4

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Maple [A]  time = 0.004, size = 41, normalized size = 0.9 \[{\frac{{a}^{2}x}{{b}^{3}}}-{\frac{a{x}^{2}}{2\,{b}^{2}}}+{\frac{{x}^{3}}{3\,b}}-{\frac{{a}^{3}\ln \left ( bx+a \right ) }{{b}^{4}}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  int(x^3/(b*x+a),x)

[Out]

a^2*x/b^3-1/2*a*x^2/b^2+1/3*x^3/b-a^3*ln(b*x+a)/b^4

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Maxima [A]  time = 1.34132, size = 57, normalized size = 1.3 \[ -\frac{a^{3} \log \left (b x + a\right )}{b^{4}} + \frac{2 \, b^{2} x^{3} - 3 \, a b x^{2} + 6 \, a^{2} x}{6 \, b^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(x^3/(b*x + a),x, algorithm="maxima")

[Out]

-a^3*log(b*x + a)/b^4 + 1/6*(2*b^2*x^3 - 3*a*b*x^2 + 6*a^2*x)/b^3

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Fricas [A]  time = 0.192691, size = 55, normalized size = 1.25 \[ \frac{2 \, b^{3} x^{3} - 3 \, a b^{2} x^{2} + 6 \, a^{2} b x - 6 \, a^{3} \log \left (b x + a\right )}{6 \, b^{4}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(x^3/(b*x + a),x, algorithm="fricas")

[Out]

1/6*(2*b^3*x^3 - 3*a*b^2*x^2 + 6*a^2*b*x - 6*a^3*log(b*x + a))/b^4

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Sympy [A]  time = 1.13516, size = 37, normalized size = 0.84 \[ - \frac{a^{3} \log{\left (a + b x \right )}}{b^{4}} + \frac{a^{2} x}{b^{3}} - \frac{a x^{2}}{2 b^{2}} + \frac{x^{3}}{3 b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(x**3/(b*x+a),x)

[Out]

-a**3*log(a + b*x)/b**4 + a**2*x/b**3 - a*x**2/(2*b**2) + x**3/(3*b)

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GIAC/XCAS [A]  time = 0.225851, size = 58, normalized size = 1.32 \[ -\frac{a^{3}{\rm ln}\left ({\left | b x + a \right |}\right )}{b^{4}} + \frac{2 \, b^{2} x^{3} - 3 \, a b x^{2} + 6 \, a^{2} x}{6 \, b^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]  integrate(x^3/(b*x + a),x, algorithm="giac")

[Out]

-a^3*ln(abs(b*x + a))/b^4 + 1/6*(2*b^2*x^3 - 3*a*b*x^2 + 6*a^2*x)/b^3