3.2680 \(\int \frac{x^{3-n}}{\sqrt{a+b x^n}} \, dx\)

Optimal. Leaf size=56 \[ \frac{x^{4-n} \sqrt{a+b x^n} \, _2F_1\left (1,\frac{1}{2} \left (\frac{8}{n}-1\right );\frac{4}{n};-\frac{b x^n}{a}\right )}{a (4-n)} \]

[Out]

(x^(4 - n)*Sqrt[a + b*x^n]*Hypergeometric2F1[1, (-1 + 8/n)/2, 4/n, -((b*x^n)/a)])/(a*(4 - n))

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Rubi [A]  time = 0.023815, antiderivative size = 65, normalized size of antiderivative = 1.16, number of steps used = 2, number of rules used = 2, integrand size = 19, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.105, Rules used = {365, 364} \[ \frac{x^{4-n} \sqrt{\frac{b x^n}{a}+1} \, _2F_1\left (\frac{1}{2},\frac{4}{n}-1;\frac{4}{n};-\frac{b x^n}{a}\right )}{(4-n) \sqrt{a+b x^n}} \]

Antiderivative was successfully verified.

[In]

Int[x^(3 - n)/Sqrt[a + b*x^n],x]

[Out]

(x^(4 - n)*Sqrt[1 + (b*x^n)/a]*Hypergeometric2F1[1/2, -1 + 4/n, 4/n, -((b*x^n)/a)])/((4 - n)*Sqrt[a + b*x^n])

Rule 365

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

Rule 364

Int[((c_.)*(x_))^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Simp[(a^p*(c*x)^(m + 1)*Hypergeometric2F1[-
p, (m + 1)/n, (m + 1)/n + 1, -((b*x^n)/a)])/(c*(m + 1)), x] /; FreeQ[{a, b, c, m, n, p}, x] &&  !IGtQ[p, 0] &&
(ILtQ[p, 0] || GtQ[a, 0])

Rubi steps

\begin{align*} \int \frac{x^{3-n}}{\sqrt{a+b x^n}} \, dx &=\frac{\sqrt{1+\frac{b x^n}{a}} \int \frac{x^{3-n}}{\sqrt{1+\frac{b x^n}{a}}} \, dx}{\sqrt{a+b x^n}}\\ &=\frac{x^{4-n} \sqrt{1+\frac{b x^n}{a}} \, _2F_1\left (\frac{1}{2},-1+\frac{4}{n};\frac{4}{n};-\frac{b x^n}{a}\right )}{(4-n) \sqrt{a+b x^n}}\\ \end{align*}

Mathematica [A]  time = 0.0213362, size = 64, normalized size = 1.14 \[ -\frac{x^{4-n} \sqrt{\frac{b x^n}{a}+1} \, _2F_1\left (\frac{1}{2},\frac{4}{n}-1;\frac{4}{n};-\frac{b x^n}{a}\right )}{(n-4) \sqrt{a+b x^n}} \]

Antiderivative was successfully verified.

[In]

Integrate[x^(3 - n)/Sqrt[a + b*x^n],x]

[Out]

-((x^(4 - n)*Sqrt[1 + (b*x^n)/a]*Hypergeometric2F1[1/2, -1 + 4/n, 4/n, -((b*x^n)/a)])/((-4 + n)*Sqrt[a + b*x^n
]))

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Maple [F]  time = 0.048, size = 0, normalized size = 0. \begin{align*} \int{{x}^{3-n}{\frac{1}{\sqrt{a+b{x}^{n}}}}}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^(3-n)/(a+b*x^n)^(1/2),x)

[Out]

int(x^(3-n)/(a+b*x^n)^(1/2),x)

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Maxima [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{x^{-n + 3}}{\sqrt{b x^{n} + a}}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^(3-n)/(a+b*x^n)^(1/2),x, algorithm="maxima")

[Out]

integrate(x^(-n + 3)/sqrt(b*x^n + a), x)

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^(3-n)/(a+b*x^n)^(1/2),x, algorithm="fricas")

[Out]

Exception raised: UnboundLocalError

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Sympy [F(-1)]  time = 0., size = 0, normalized size = 0. \begin{align*} \text{Timed out} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x**(3-n)/(a+b*x**n)**(1/2),x)

[Out]

Timed out

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{x^{-n + 3}}{\sqrt{b x^{n} + a}}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^(3-n)/(a+b*x^n)^(1/2),x, algorithm="giac")

[Out]

integrate(x^(-n + 3)/sqrt(b*x^n + a), x)