3.1645 \(\int \frac{1}{(a+\frac{b}{x})^3 x^8} \, dx\)

Optimal. Leaf size=97 \[ -\frac{3 a^2}{b^5 x^2}+\frac{5 a^4}{b^6 (a x+b)}+\frac{a^4}{2 b^5 (a x+b)^2}+\frac{10 a^3}{b^6 x}+\frac{15 a^4 \log (x)}{b^7}-\frac{15 a^4 \log (a x+b)}{b^7}+\frac{a}{b^4 x^3}-\frac{1}{4 b^3 x^4} \]

[Out]

-1/(4*b^3*x^4) + a/(b^4*x^3) - (3*a^2)/(b^5*x^2) + (10*a^3)/(b^6*x) + a^4/(2*b^5*(b + a*x)^2) + (5*a^4)/(b^6*(
b + a*x)) + (15*a^4*Log[x])/b^7 - (15*a^4*Log[b + a*x])/b^7

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Rubi [A]  time = 0.0567562, antiderivative size = 97, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 2, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.154, Rules used = {263, 44} \[ -\frac{3 a^2}{b^5 x^2}+\frac{5 a^4}{b^6 (a x+b)}+\frac{a^4}{2 b^5 (a x+b)^2}+\frac{10 a^3}{b^6 x}+\frac{15 a^4 \log (x)}{b^7}-\frac{15 a^4 \log (a x+b)}{b^7}+\frac{a}{b^4 x^3}-\frac{1}{4 b^3 x^4} \]

Antiderivative was successfully verified.

[In]

Int[1/((a + b/x)^3*x^8),x]

[Out]

-1/(4*b^3*x^4) + a/(b^4*x^3) - (3*a^2)/(b^5*x^2) + (10*a^3)/(b^6*x) + a^4/(2*b^5*(b + a*x)^2) + (5*a^4)/(b^6*(
b + a*x)) + (15*a^4*Log[x])/b^7 - (15*a^4*Log[b + a*x])/b^7

Rule 263

Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Int[x^(m + n*p)*(b + a/x^n)^p, x] /; FreeQ[{a, b, m
, n}, x] && IntegerQ[p] && NegQ[n]

Rule 44

Int[((a_) + (b_.)*(x_))^(m_.)*((c_.) + (d_.)*(x_))^(n_.), x_Symbol] :> Int[ExpandIntegrand[(a + b*x)^m*(c + d*
x)^n, x], x] /; FreeQ[{a, b, c, d}, x] && NeQ[b*c - a*d, 0] && ILtQ[m, 0] && IntegerQ[n] &&  !(IGtQ[n, 0] && L
tQ[m + n + 2, 0])

Rubi steps

\begin{align*} \int \frac{1}{\left (a+\frac{b}{x}\right )^3 x^8} \, dx &=\int \frac{1}{x^5 (b+a x)^3} \, dx\\ &=\int \left (\frac{1}{b^3 x^5}-\frac{3 a}{b^4 x^4}+\frac{6 a^2}{b^5 x^3}-\frac{10 a^3}{b^6 x^2}+\frac{15 a^4}{b^7 x}-\frac{a^5}{b^5 (b+a x)^3}-\frac{5 a^5}{b^6 (b+a x)^2}-\frac{15 a^5}{b^7 (b+a x)}\right ) \, dx\\ &=-\frac{1}{4 b^3 x^4}+\frac{a}{b^4 x^3}-\frac{3 a^2}{b^5 x^2}+\frac{10 a^3}{b^6 x}+\frac{a^4}{2 b^5 (b+a x)^2}+\frac{5 a^4}{b^6 (b+a x)}+\frac{15 a^4 \log (x)}{b^7}-\frac{15 a^4 \log (b+a x)}{b^7}\\ \end{align*}

Mathematica [A]  time = 0.0513169, size = 90, normalized size = 0.93 \[ \frac{\frac{b \left (-5 a^2 b^3 x^2+20 a^3 b^2 x^3+90 a^4 b x^4+60 a^5 x^5+2 a b^4 x-b^5\right )}{x^4 (a x+b)^2}-60 a^4 \log (a x+b)+60 a^4 \log (x)}{4 b^7} \]

Antiderivative was successfully verified.

[In]

Integrate[1/((a + b/x)^3*x^8),x]

[Out]

((b*(-b^5 + 2*a*b^4*x - 5*a^2*b^3*x^2 + 20*a^3*b^2*x^3 + 90*a^4*b*x^4 + 60*a^5*x^5))/(x^4*(b + a*x)^2) + 60*a^
4*Log[x] - 60*a^4*Log[b + a*x])/(4*b^7)

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Maple [A]  time = 0.01, size = 94, normalized size = 1. \begin{align*} -{\frac{1}{4\,{b}^{3}{x}^{4}}}+{\frac{a}{{b}^{4}{x}^{3}}}-3\,{\frac{{a}^{2}}{{b}^{5}{x}^{2}}}+10\,{\frac{{a}^{3}}{{b}^{6}x}}+{\frac{{a}^{4}}{2\,{b}^{5} \left ( ax+b \right ) ^{2}}}+5\,{\frac{{a}^{4}}{{b}^{6} \left ( ax+b \right ) }}+15\,{\frac{{a}^{4}\ln \left ( x \right ) }{{b}^{7}}}-15\,{\frac{{a}^{4}\ln \left ( ax+b \right ) }{{b}^{7}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(a+b/x)^3/x^8,x)

[Out]

-1/4/b^3/x^4+a/b^4/x^3-3*a^2/b^5/x^2+10*a^3/b^6/x+1/2*a^4/b^5/(a*x+b)^2+5*a^4/b^6/(a*x+b)+15*a^4*ln(x)/b^7-15*
a^4*ln(a*x+b)/b^7

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Maxima [A]  time = 1.0081, size = 146, normalized size = 1.51 \begin{align*} \frac{60 \, a^{5} x^{5} + 90 \, a^{4} b x^{4} + 20 \, a^{3} b^{2} x^{3} - 5 \, a^{2} b^{3} x^{2} + 2 \, a b^{4} x - b^{5}}{4 \,{\left (a^{2} b^{6} x^{6} + 2 \, a b^{7} x^{5} + b^{8} x^{4}\right )}} - \frac{15 \, a^{4} \log \left (a x + b\right )}{b^{7}} + \frac{15 \, a^{4} \log \left (x\right )}{b^{7}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(a+b/x)^3/x^8,x, algorithm="maxima")

[Out]

1/4*(60*a^5*x^5 + 90*a^4*b*x^4 + 20*a^3*b^2*x^3 - 5*a^2*b^3*x^2 + 2*a*b^4*x - b^5)/(a^2*b^6*x^6 + 2*a*b^7*x^5
+ b^8*x^4) - 15*a^4*log(a*x + b)/b^7 + 15*a^4*log(x)/b^7

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Fricas [A]  time = 1.70736, size = 313, normalized size = 3.23 \begin{align*} \frac{60 \, a^{5} b x^{5} + 90 \, a^{4} b^{2} x^{4} + 20 \, a^{3} b^{3} x^{3} - 5 \, a^{2} b^{4} x^{2} + 2 \, a b^{5} x - b^{6} - 60 \,{\left (a^{6} x^{6} + 2 \, a^{5} b x^{5} + a^{4} b^{2} x^{4}\right )} \log \left (a x + b\right ) + 60 \,{\left (a^{6} x^{6} + 2 \, a^{5} b x^{5} + a^{4} b^{2} x^{4}\right )} \log \left (x\right )}{4 \,{\left (a^{2} b^{7} x^{6} + 2 \, a b^{8} x^{5} + b^{9} x^{4}\right )}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(a+b/x)^3/x^8,x, algorithm="fricas")

[Out]

1/4*(60*a^5*b*x^5 + 90*a^4*b^2*x^4 + 20*a^3*b^3*x^3 - 5*a^2*b^4*x^2 + 2*a*b^5*x - b^6 - 60*(a^6*x^6 + 2*a^5*b*
x^5 + a^4*b^2*x^4)*log(a*x + b) + 60*(a^6*x^6 + 2*a^5*b*x^5 + a^4*b^2*x^4)*log(x))/(a^2*b^7*x^6 + 2*a*b^8*x^5
+ b^9*x^4)

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Sympy [A]  time = 0.621007, size = 102, normalized size = 1.05 \begin{align*} \frac{15 a^{4} \left (\log{\left (x \right )} - \log{\left (x + \frac{b}{a} \right )}\right )}{b^{7}} + \frac{60 a^{5} x^{5} + 90 a^{4} b x^{4} + 20 a^{3} b^{2} x^{3} - 5 a^{2} b^{3} x^{2} + 2 a b^{4} x - b^{5}}{4 a^{2} b^{6} x^{6} + 8 a b^{7} x^{5} + 4 b^{8} x^{4}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(a+b/x)**3/x**8,x)

[Out]

15*a**4*(log(x) - log(x + b/a))/b**7 + (60*a**5*x**5 + 90*a**4*b*x**4 + 20*a**3*b**2*x**3 - 5*a**2*b**3*x**2 +
2*a*b**4*x - b**5)/(4*a**2*b**6*x**6 + 8*a*b**7*x**5 + 4*b**8*x**4)

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Giac [A]  time = 1.07672, size = 131, normalized size = 1.35 \begin{align*} -\frac{15 \, a^{4} \log \left ({\left | a x + b \right |}\right )}{b^{7}} + \frac{15 \, a^{4} \log \left ({\left | x \right |}\right )}{b^{7}} + \frac{60 \, a^{5} b x^{5} + 90 \, a^{4} b^{2} x^{4} + 20 \, a^{3} b^{3} x^{3} - 5 \, a^{2} b^{4} x^{2} + 2 \, a b^{5} x - b^{6}}{4 \,{\left (a x + b\right )}^{2} b^{7} x^{4}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(a+b/x)^3/x^8,x, algorithm="giac")

[Out]

-15*a^4*log(abs(a*x + b))/b^7 + 15*a^4*log(abs(x))/b^7 + 1/4*(60*a^5*b*x^5 + 90*a^4*b^2*x^4 + 20*a^3*b^3*x^3 -
5*a^2*b^4*x^2 + 2*a*b^5*x - b^6)/((a*x + b)^2*b^7*x^4)