3.12.78 \(\int x^7 \sqrt [4]{a-b x^4} \, dx\) [1178]

Optimal. Leaf size=40 \[ -\frac {a \left (a-b x^4\right )^{5/4}}{5 b^2}+\frac {\left (a-b x^4\right )^{9/4}}{9 b^2} \]

[Out]

-1/5*a*(-b*x^4+a)^(5/4)/b^2+1/9*(-b*x^4+a)^(9/4)/b^2

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Rubi [A]
time = 0.02, antiderivative size = 40, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 16, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.125, Rules used = {272, 45} \begin {gather*} \frac {\left (a-b x^4\right )^{9/4}}{9 b^2}-\frac {a \left (a-b x^4\right )^{5/4}}{5 b^2} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[x^7*(a - b*x^4)^(1/4),x]

[Out]

-1/5*(a*(a - b*x^4)^(5/4))/b^2 + (a - b*x^4)^(9/4)/(9*b^2)

Rule 45

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, n}, x] && NeQ[b*c - a*d, 0] && IGtQ[m, 0] && ( !IntegerQ[n] || (EqQ[c, 0]
&& LeQ[7*m + 4*n + 4, 0]) || LtQ[9*m + 5*(n + 1), 0] || GtQ[m + n + 2, 0])

Rule 272

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

Rubi steps

\begin {align*} \int x^7 \sqrt [4]{a-b x^4} \, dx &=\frac {1}{4} \text {Subst}\left (\int x \sqrt [4]{a-b x} \, dx,x,x^4\right )\\ &=\frac {1}{4} \text {Subst}\left (\int \left (\frac {a \sqrt [4]{a-b x}}{b}-\frac {(a-b x)^{5/4}}{b}\right ) \, dx,x,x^4\right )\\ &=-\frac {a \left (a-b x^4\right )^{5/4}}{5 b^2}+\frac {\left (a-b x^4\right )^{9/4}}{9 b^2}\\ \end {align*}

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Mathematica [A]
time = 0.03, size = 40, normalized size = 1.00 \begin {gather*} \frac {\sqrt [4]{a-b x^4} \left (-4 a^2-a b x^4+5 b^2 x^8\right )}{45 b^2} \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[x^7*(a - b*x^4)^(1/4),x]

[Out]

((a - b*x^4)^(1/4)*(-4*a^2 - a*b*x^4 + 5*b^2*x^8))/(45*b^2)

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Maple [A]
time = 0.16, size = 26, normalized size = 0.65

method	result	size
gosper	\(-\frac {\left (-b \,x^{4}+a \right )^{\frac {5}{4}} \left (5 b \,x^{4}+4 a \right )}{45 b^{2}}\)	\(26\)
trager	\(-\frac {\left (-5 b^{2} x^{8}+a b \,x^{4}+4 a^{2}\right ) \left (-b \,x^{4}+a \right )^{\frac {1}{4}}}{45 b^{2}}\)	\(36\)
risch	\(-\frac {\left (-b \,x^{4}+a \right )^{\frac {1}{4}} \left (\left (-b \,x^{4}+a \right )^{3}\right )^{\frac {1}{4}} \left (-5 b^{2} x^{8}+a b \,x^{4}+4 a^{2}\right )}{45 b^{2} \left (-\left (b \,x^{4}-a \right )^{3}\right )^{\frac {1}{4}}}\)	\(63\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^7*(-b*x^4+a)^(1/4),x,method=_RETURNVERBOSE)

[Out]

-1/45*(-b*x^4+a)^(5/4)*(5*b*x^4+4*a)/b^2

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Maxima [A]
time = 0.30, size = 32, normalized size = 0.80 \begin {gather*} \frac {{\left (-b x^{4} + a\right )}^{\frac {9}{4}}}{9 \, b^{2}} - \frac {{\left (-b x^{4} + a\right )}^{\frac {5}{4}} a}{5 \, b^{2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^7*(-b*x^4+a)^(1/4),x, algorithm="maxima")

[Out]

1/9*(-b*x^4 + a)^(9/4)/b^2 - 1/5*(-b*x^4 + a)^(5/4)*a/b^2

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Fricas [A]
time = 0.36, size = 36, normalized size = 0.90 \begin {gather*} \frac {{\left (5 \, b^{2} x^{8} - a b x^{4} - 4 \, a^{2}\right )} {\left (-b x^{4} + a\right )}^{\frac {1}{4}}}{45 \, b^{2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^7*(-b*x^4+a)^(1/4),x, algorithm="fricas")

[Out]

1/45*(5*b^2*x^8 - a*b*x^4 - 4*a^2)*(-b*x^4 + a)^(1/4)/b^2

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Sympy [B] Leaf count of result is larger than twice the leaf count of optimal. 63 vs. \(2 (31) = 62\).
time = 0.22, size = 63, normalized size = 1.58 \begin {gather*} \begin {cases} - \frac {4 a^{2} \sqrt [4]{a - b x^{4}}}{45 b^{2}} - \frac {a x^{4} \sqrt [4]{a - b x^{4}}}{45 b} + \frac {x^{8} \sqrt [4]{a - b x^{4}}}{9} & \text {for}\: b \neq 0 \\\frac {\sqrt [4]{a} x^{8}}{8} & \text {otherwise} \end {cases} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x**7*(-b*x**4+a)**(1/4),x)

[Out]

Piecewise((-4*a**2*(a - b*x**4)**(1/4)/(45*b**2) - a*x**4*(a - b*x**4)**(1/4)/(45*b) + x**8*(a - b*x**4)**(1/4
)/9, Ne(b, 0)), (a**(1/4)*x**8/8, True))

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Giac [A]
time = 1.11, size = 42, normalized size = 1.05 \begin {gather*} \frac {5 \, {\left (b x^{4} - a\right )}^{2} {\left (-b x^{4} + a\right )}^{\frac {1}{4}} - 9 \, {\left (-b x^{4} + a\right )}^{\frac {5}{4}} a}{45 \, b^{2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^7*(-b*x^4+a)^(1/4),x, algorithm="giac")

[Out]

1/45*(5*(b*x^4 - a)^2*(-b*x^4 + a)^(1/4) - 9*(-b*x^4 + a)^(5/4)*a)/b^2

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Mupad [B]
time = 1.12, size = 35, normalized size = 0.88 \begin {gather*} -{\left (a-b\,x^4\right )}^{1/4}\,\left (\frac {4\,a^2}{45\,b^2}-\frac {x^8}{9}+\frac {a\,x^4}{45\,b}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^7*(a - b*x^4)^(1/4),x)

[Out]

-(a - b*x^4)^(1/4)*((4*a^2)/(45*b^2) - x^8/9 + (a*x^4)/(45*b))

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