3.1032 \(\int x^8 (a+b x^4)^{3/4} \, dx\)

Optimal. Leaf size=125 \[ -\frac{5 a^2 x \left (a+b x^4\right )^{3/4}}{128 b^2}+\frac{5 a^3 \tan ^{-1}\left (\frac{\sqrt [4]{b} x}{\sqrt [4]{a+b x^4}}\right )}{256 b^{9/4}}+\frac{5 a^3 \tanh ^{-1}\left (\frac{\sqrt [4]{b} x}{\sqrt [4]{a+b x^4}}\right )}{256 b^{9/4}}+\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}+\frac{a x^5 \left (a+b x^4\right )^{3/4}}{32 b} \]

[Out]

(-5*a^2*x*(a + b*x^4)^(3/4))/(128*b^2) + (a*x^5*(a + b*x^4)^(3/4))/(32*b) + (x^9*(a + b*x^4)^(3/4))/12 + (5*a^
3*ArcTan[(b^(1/4)*x)/(a + b*x^4)^(1/4)])/(256*b^(9/4)) + (5*a^3*ArcTanh[(b^(1/4)*x)/(a + b*x^4)^(1/4)])/(256*b
^(9/4))

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Rubi [A]  time = 0.0450163, antiderivative size = 125, normalized size of antiderivative = 1., number of steps used = 7, number of rules used = 6, integrand size = 15, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.4, Rules used = {279, 321, 240, 212, 206, 203} \[ -\frac{5 a^2 x \left (a+b x^4\right )^{3/4}}{128 b^2}+\frac{5 a^3 \tan ^{-1}\left (\frac{\sqrt [4]{b} x}{\sqrt [4]{a+b x^4}}\right )}{256 b^{9/4}}+\frac{5 a^3 \tanh ^{-1}\left (\frac{\sqrt [4]{b} x}{\sqrt [4]{a+b x^4}}\right )}{256 b^{9/4}}+\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}+\frac{a x^5 \left (a+b x^4\right )^{3/4}}{32 b} \]

Antiderivative was successfully verified.

[In]

Int[x^8*(a + b*x^4)^(3/4),x]

[Out]

(-5*a^2*x*(a + b*x^4)^(3/4))/(128*b^2) + (a*x^5*(a + b*x^4)^(3/4))/(32*b) + (x^9*(a + b*x^4)^(3/4))/12 + (5*a^
3*ArcTan[(b^(1/4)*x)/(a + b*x^4)^(1/4)])/(256*b^(9/4)) + (5*a^3*ArcTanh[(b^(1/4)*x)/(a + b*x^4)^(1/4)])/(256*b
^(9/4))

Rule 279

Int[((c_.)*(x_))^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Simp[((c*x)^(m + 1)*(a + b*x^n)^p)/(c*(m +
n*p + 1)), x] + Dist[(a*n*p)/(m + n*p + 1), Int[(c*x)^m*(a + b*x^n)^(p - 1), x], x] /; FreeQ[{a, b, c, m}, x]
&& IGtQ[n, 0] && GtQ[p, 0] && NeQ[m + n*p + 1, 0] && IntBinomialQ[a, b, c, n, m, p, x]

Rule 321

Int[((c_.)*(x_))^(m_)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Simp[(c^(n - 1)*(c*x)^(m - n + 1)*(a + b*x^n
)^(p + 1))/(b*(m + n*p + 1)), x] - Dist[(a*c^n*(m - n + 1))/(b*(m + n*p + 1)), Int[(c*x)^(m - n)*(a + b*x^n)^p
, x], x] /; FreeQ[{a, b, c, p}, x] && IGtQ[n, 0] && GtQ[m, n - 1] && NeQ[m + n*p + 1, 0] && IntBinomialQ[a, b,
c, n, m, p, x]

Rule 240

Int[((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Dist[a^(p + 1/n), Subst[Int[1/(1 - b*x^n)^(p + 1/n + 1), x], x
, x/(a + b*x^n)^(1/n)], x] /; FreeQ[{a, b}, x] && IGtQ[n, 0] && LtQ[-1, p, 0] && NeQ[p, -2^(-1)] && IntegerQ[p
+ 1/n]

Rule 212

Int[((a_) + (b_.)*(x_)^4)^(-1), x_Symbol] :> With[{r = Numerator[Rt[-(a/b), 2]], s = Denominator[Rt[-(a/b), 2]
]}, Dist[r/(2*a), Int[1/(r - s*x^2), x], x] + Dist[r/(2*a), Int[1/(r + s*x^2), x], x]] /; FreeQ[{a, b}, x] &&
!GtQ[a/b, 0]

Rule 206

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1*ArcTanh[(Rt[-b, 2]*x)/Rt[a, 2]])/(Rt[a, 2]*Rt[-b, 2]), x]
/; FreeQ[{a, b}, x] && NegQ[a/b] && (GtQ[a, 0] || LtQ[b, 0])

Rule 203

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1*ArcTan[(Rt[b, 2]*x)/Rt[a, 2]])/(Rt[a, 2]*Rt[b, 2]), x] /;
FreeQ[{a, b}, x] && PosQ[a/b] && (GtQ[a, 0] || GtQ[b, 0])

Rubi steps

\begin{align*} \int x^8 \left (a+b x^4\right )^{3/4} \, dx &=\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}+\frac{1}{4} a \int \frac{x^8}{\sqrt [4]{a+b x^4}} \, dx\\ &=\frac{a x^5 \left (a+b x^4\right )^{3/4}}{32 b}+\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}-\frac{\left (5 a^2\right ) \int \frac{x^4}{\sqrt [4]{a+b x^4}} \, dx}{32 b}\\ &=-\frac{5 a^2 x \left (a+b x^4\right )^{3/4}}{128 b^2}+\frac{a x^5 \left (a+b x^4\right )^{3/4}}{32 b}+\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}+\frac{\left (5 a^3\right ) \int \frac{1}{\sqrt [4]{a+b x^4}} \, dx}{128 b^2}\\ &=-\frac{5 a^2 x \left (a+b x^4\right )^{3/4}}{128 b^2}+\frac{a x^5 \left (a+b x^4\right )^{3/4}}{32 b}+\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}+\frac{\left (5 a^3\right ) \operatorname{Subst}\left (\int \frac{1}{1-b x^4} \, dx,x,\frac{x}{\sqrt [4]{a+b x^4}}\right )}{128 b^2}\\ &=-\frac{5 a^2 x \left (a+b x^4\right )^{3/4}}{128 b^2}+\frac{a x^5 \left (a+b x^4\right )^{3/4}}{32 b}+\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}+\frac{\left (5 a^3\right ) \operatorname{Subst}\left (\int \frac{1}{1-\sqrt{b} x^2} \, dx,x,\frac{x}{\sqrt [4]{a+b x^4}}\right )}{256 b^2}+\frac{\left (5 a^3\right ) \operatorname{Subst}\left (\int \frac{1}{1+\sqrt{b} x^2} \, dx,x,\frac{x}{\sqrt [4]{a+b x^4}}\right )}{256 b^2}\\ &=-\frac{5 a^2 x \left (a+b x^4\right )^{3/4}}{128 b^2}+\frac{a x^5 \left (a+b x^4\right )^{3/4}}{32 b}+\frac{1}{12} x^9 \left (a+b x^4\right )^{3/4}+\frac{5 a^3 \tan ^{-1}\left (\frac{\sqrt [4]{b} x}{\sqrt [4]{a+b x^4}}\right )}{256 b^{9/4}}+\frac{5 a^3 \tanh ^{-1}\left (\frac{\sqrt [4]{b} x}{\sqrt [4]{a+b x^4}}\right )}{256 b^{9/4}}\\ \end{align*}

Mathematica [C]  time = 0.0502763, size = 94, normalized size = 0.75 \[ \frac{x \left (a+b x^4\right )^{3/4} \left (\left (\frac{b x^4}{a}+1\right )^{3/4} \left (-5 a^2+3 a b x^4+8 b^2 x^8\right )+5 a^2 \, _2F_1\left (-\frac{3}{4},\frac{1}{4};\frac{5}{4};-\frac{b x^4}{a}\right )\right )}{96 b^2 \left (\frac{b x^4}{a}+1\right )^{3/4}} \]

Antiderivative was successfully verified.

[In]

Integrate[x^8*(a + b*x^4)^(3/4),x]

[Out]

(x*(a + b*x^4)^(3/4)*((1 + (b*x^4)/a)^(3/4)*(-5*a^2 + 3*a*b*x^4 + 8*b^2*x^8) + 5*a^2*Hypergeometric2F1[-3/4, 1
/4, 5/4, -((b*x^4)/a)]))/(96*b^2*(1 + (b*x^4)/a)^(3/4))

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Maple [F]  time = 0.026, size = 0, normalized size = 0. \begin{align*} \int{x}^{8} \left ( b{x}^{4}+a \right ) ^{{\frac{3}{4}}}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^8*(b*x^4+a)^(3/4),x)

[Out]

int(x^8*(b*x^4+a)^(3/4),x)

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Maxima [F(-2)]  time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: ValueError} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^8*(b*x^4+a)^(3/4),x, algorithm="maxima")

[Out]

Exception raised: ValueError

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Fricas [B]  time = 1.95779, size = 567, normalized size = 4.54 \begin{align*} \frac{60 \, \left (\frac{a^{12}}{b^{9}}\right )^{\frac{1}{4}} b^{2} \arctan \left (-\frac{{\left (b x^{4} + a\right )}^{\frac{1}{4}} \left (\frac{a^{12}}{b^{9}}\right )^{\frac{1}{4}} a^{9} b^{2} - \left (\frac{a^{12}}{b^{9}}\right )^{\frac{1}{4}} b^{2} x \sqrt{\frac{\sqrt{\frac{a^{12}}{b^{9}}} a^{12} b^{5} x^{2} + \sqrt{b x^{4} + a} a^{18}}{x^{2}}}}{a^{12} x}\right ) + 15 \, \left (\frac{a^{12}}{b^{9}}\right )^{\frac{1}{4}} b^{2} \log \left (\frac{125 \,{\left ({\left (b x^{4} + a\right )}^{\frac{1}{4}} a^{9} + \left (\frac{a^{12}}{b^{9}}\right )^{\frac{3}{4}} b^{7} x\right )}}{x}\right ) - 15 \, \left (\frac{a^{12}}{b^{9}}\right )^{\frac{1}{4}} b^{2} \log \left (\frac{125 \,{\left ({\left (b x^{4} + a\right )}^{\frac{1}{4}} a^{9} - \left (\frac{a^{12}}{b^{9}}\right )^{\frac{3}{4}} b^{7} x\right )}}{x}\right ) + 4 \,{\left (32 \, b^{2} x^{9} + 12 \, a b x^{5} - 15 \, a^{2} x\right )}{\left (b x^{4} + a\right )}^{\frac{3}{4}}}{1536 \, b^{2}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^8*(b*x^4+a)^(3/4),x, algorithm="fricas")

[Out]

1/1536*(60*(a^12/b^9)^(1/4)*b^2*arctan(-((b*x^4 + a)^(1/4)*(a^12/b^9)^(1/4)*a^9*b^2 - (a^12/b^9)^(1/4)*b^2*x*s
qrt((sqrt(a^12/b^9)*a^12*b^5*x^2 + sqrt(b*x^4 + a)*a^18)/x^2))/(a^12*x)) + 15*(a^12/b^9)^(1/4)*b^2*log(125*((b
*x^4 + a)^(1/4)*a^9 + (a^12/b^9)^(3/4)*b^7*x)/x) - 15*(a^12/b^9)^(1/4)*b^2*log(125*((b*x^4 + a)^(1/4)*a^9 - (a
^12/b^9)^(3/4)*b^7*x)/x) + 4*(32*b^2*x^9 + 12*a*b*x^5 - 15*a^2*x)*(b*x^4 + a)^(3/4))/b^2

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Sympy [C]  time = 3.80278, size = 39, normalized size = 0.31 \begin{align*} \frac{a^{\frac{3}{4}} x^{9} \Gamma \left (\frac{9}{4}\right ){{}_{2}F_{1}\left (\begin{matrix} - \frac{3}{4}, \frac{9}{4} \\ \frac{13}{4} \end{matrix}\middle |{\frac{b x^{4} e^{i \pi }}{a}} \right )}}{4 \Gamma \left (\frac{13}{4}\right )} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x**8*(b*x**4+a)**(3/4),x)

[Out]

a**(3/4)*x**9*gamma(9/4)*hyper((-3/4, 9/4), (13/4,), b*x**4*exp_polar(I*pi)/a)/(4*gamma(13/4))

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int{\left (b x^{4} + a\right )}^{\frac{3}{4}} x^{8}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^8*(b*x^4+a)^(3/4),x, algorithm="giac")

[Out]

integrate((b*x^4 + a)^(3/4)*x^8, x)