3.514 \(\int x^{3/2} \sqrt{2-b x} \, dx\)

Optimal. Leaf size=87 \[ -\frac{\sqrt{x} \sqrt{2-b x}}{2 b^2}+\frac{\sin ^{-1}\left (\frac{\sqrt{b} \sqrt{x}}{\sqrt{2}}\right )}{b^{5/2}}+\frac{1}{3} x^{5/2} \sqrt{2-b x}-\frac{x^{3/2} \sqrt{2-b x}}{6 b} \]

[Out]

-(Sqrt[x]*Sqrt[2 - b*x])/(2*b^2) - (x^(3/2)*Sqrt[2 - b*x])/(6*b) + (x^(5/2)*Sqrt[2 - b*x])/3 + ArcSin[(Sqrt[b]
*Sqrt[x])/Sqrt[2]]/b^(5/2)

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Rubi [A]  time = 0.022504, antiderivative size = 87, normalized size of antiderivative = 1., number of steps used = 5, number of rules used = 3, integrand size = 16, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.188, Rules used = {50, 54, 216} \[ -\frac{\sqrt{x} \sqrt{2-b x}}{2 b^2}+\frac{\sin ^{-1}\left (\frac{\sqrt{b} \sqrt{x}}{\sqrt{2}}\right )}{b^{5/2}}+\frac{1}{3} x^{5/2} \sqrt{2-b x}-\frac{x^{3/2} \sqrt{2-b x}}{6 b} \]

Antiderivative was successfully verified.

[In]

Int[x^(3/2)*Sqrt[2 - b*x],x]

[Out]

-(Sqrt[x]*Sqrt[2 - b*x])/(2*b^2) - (x^(3/2)*Sqrt[2 - b*x])/(6*b) + (x^(5/2)*Sqrt[2 - b*x])/3 + ArcSin[(Sqrt[b]
*Sqrt[x])/Sqrt[2]]/b^(5/2)

Rule 50

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> Simp[((a + b*x)^(m + 1)*(c + d*x)^n)/(b*
(m + n + 1)), x] + Dist[(n*(b*c - a*d))/(b*(m + n + 1)), Int[(a + b*x)^m*(c + d*x)^(n - 1), x], x] /; FreeQ[{a
, b, c, d}, x] && NeQ[b*c - a*d, 0] && GtQ[n, 0] && NeQ[m + n + 1, 0] &&  !(IGtQ[m, 0] && ( !IntegerQ[n] || (G
tQ[m, 0] && LtQ[m - n, 0]))) &&  !ILtQ[m + n + 2, 0] && IntLinearQ[a, b, c, d, m, n, x]

Rule 54

Int[1/(Sqrt[(a_.) + (b_.)*(x_)]*Sqrt[(c_.) + (d_.)*(x_)]), x_Symbol] :> Dist[2/Sqrt[b], Subst[Int[1/Sqrt[b*c -
a*d + d*x^2], x], x, Sqrt[a + b*x]], x] /; FreeQ[{a, b, c, d}, x] && GtQ[b*c - a*d, 0] && GtQ[b, 0]

Rule 216

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

Rubi steps

\begin{align*} \int x^{3/2} \sqrt{2-b x} \, dx &=\frac{1}{3} x^{5/2} \sqrt{2-b x}+\frac{1}{3} \int \frac{x^{3/2}}{\sqrt{2-b x}} \, dx\\ &=-\frac{x^{3/2} \sqrt{2-b x}}{6 b}+\frac{1}{3} x^{5/2} \sqrt{2-b x}+\frac{\int \frac{\sqrt{x}}{\sqrt{2-b x}} \, dx}{2 b}\\ &=-\frac{\sqrt{x} \sqrt{2-b x}}{2 b^2}-\frac{x^{3/2} \sqrt{2-b x}}{6 b}+\frac{1}{3} x^{5/2} \sqrt{2-b x}+\frac{\int \frac{1}{\sqrt{x} \sqrt{2-b x}} \, dx}{2 b^2}\\ &=-\frac{\sqrt{x} \sqrt{2-b x}}{2 b^2}-\frac{x^{3/2} \sqrt{2-b x}}{6 b}+\frac{1}{3} x^{5/2} \sqrt{2-b x}+\frac{\operatorname{Subst}\left (\int \frac{1}{\sqrt{2-b x^2}} \, dx,x,\sqrt{x}\right )}{b^2}\\ &=-\frac{\sqrt{x} \sqrt{2-b x}}{2 b^2}-\frac{x^{3/2} \sqrt{2-b x}}{6 b}+\frac{1}{3} x^{5/2} \sqrt{2-b x}+\frac{\sin ^{-1}\left (\frac{\sqrt{b} \sqrt{x}}{\sqrt{2}}\right )}{b^{5/2}}\\ \end{align*}

Mathematica [A]  time = 0.0587462, size = 60, normalized size = 0.69 \[ \frac{\sqrt{x} \sqrt{2-b x} \left (2 b^2 x^2-b x-3\right )}{6 b^2}+\frac{\sin ^{-1}\left (\frac{\sqrt{b} \sqrt{x}}{\sqrt{2}}\right )}{b^{5/2}} \]

Antiderivative was successfully verified.

[In]

Integrate[x^(3/2)*Sqrt[2 - b*x],x]

[Out]

(Sqrt[x]*Sqrt[2 - b*x]*(-3 - b*x + 2*b^2*x^2))/(6*b^2) + ArcSin[(Sqrt[b]*Sqrt[x])/Sqrt[2]]/b^(5/2)

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Maple [A]  time = 0.004, size = 100, normalized size = 1.2 \begin{align*} -{\frac{1}{3\,b}{x}^{{\frac{3}{2}}} \left ( -bx+2 \right ) ^{{\frac{3}{2}}}}-{\frac{1}{2\,{b}^{2}} \left ( -bx+2 \right ) ^{{\frac{3}{2}}}\sqrt{x}}+{\frac{1}{2\,{b}^{2}}\sqrt{x}\sqrt{-bx+2}}+{\frac{1}{2}\sqrt{ \left ( -bx+2 \right ) x}\arctan \left ({\sqrt{b} \left ( x-{b}^{-1} \right ){\frac{1}{\sqrt{-b{x}^{2}+2\,x}}}} \right ){b}^{-{\frac{5}{2}}}{\frac{1}{\sqrt{-bx+2}}}{\frac{1}{\sqrt{x}}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/3/b*x^(3/2)*(-b*x+2)^(3/2)-1/2/b^2*x^(1/2)*(-b*x+2)^(3/2)+1/2*x^(1/2)*(-b*x+2)^(1/2)/b^2+1/2/b^(5/2)*((-b*x
+2)*x)^(1/2)/(-b*x+2)^(1/2)/x^(1/2)*arctan(b^(1/2)*(x-1/b)/(-b*x^2+2*x)^(1/2))

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

[Out]

Exception raised: ValueError

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Fricas [A]  time = 1.53088, size = 321, normalized size = 3.69 \begin{align*} \left [\frac{{\left (2 \, b^{3} x^{2} - b^{2} x - 3 \, b\right )} \sqrt{-b x + 2} \sqrt{x} - 3 \, \sqrt{-b} \log \left (-b x + \sqrt{-b x + 2} \sqrt{-b} \sqrt{x} + 1\right )}{6 \, b^{3}}, \frac{{\left (2 \, b^{3} x^{2} - b^{2} x - 3 \, b\right )} \sqrt{-b x + 2} \sqrt{x} - 6 \, \sqrt{b} \arctan \left (\frac{\sqrt{-b x + 2}}{\sqrt{b} \sqrt{x}}\right )}{6 \, b^{3}}\right ] \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

[1/6*((2*b^3*x^2 - b^2*x - 3*b)*sqrt(-b*x + 2)*sqrt(x) - 3*sqrt(-b)*log(-b*x + sqrt(-b*x + 2)*sqrt(-b)*sqrt(x)
+ 1))/b^3, 1/6*((2*b^3*x^2 - b^2*x - 3*b)*sqrt(-b*x + 2)*sqrt(x) - 6*sqrt(b)*arctan(sqrt(-b*x + 2)/(sqrt(b)*s
qrt(x))))/b^3]

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Sympy [A]  time = 6.35489, size = 196, normalized size = 2.25 \begin{align*} \begin{cases} \frac{i b x^{\frac{7}{2}}}{3 \sqrt{b x - 2}} - \frac{5 i x^{\frac{5}{2}}}{6 \sqrt{b x - 2}} - \frac{i x^{\frac{3}{2}}}{6 b \sqrt{b x - 2}} + \frac{i \sqrt{x}}{b^{2} \sqrt{b x - 2}} - \frac{i \operatorname{acosh}{\left (\frac{\sqrt{2} \sqrt{b} \sqrt{x}}{2} \right )}}{b^{\frac{5}{2}}} & \text{for}\: \frac{\left |{b x}\right |}{2} > 1 \\- \frac{b x^{\frac{7}{2}}}{3 \sqrt{- b x + 2}} + \frac{5 x^{\frac{5}{2}}}{6 \sqrt{- b x + 2}} + \frac{x^{\frac{3}{2}}}{6 b \sqrt{- b x + 2}} - \frac{\sqrt{x}}{b^{2} \sqrt{- b x + 2}} + \frac{\operatorname{asin}{\left (\frac{\sqrt{2} \sqrt{b} \sqrt{x}}{2} \right )}}{b^{\frac{5}{2}}} & \text{otherwise} \end{cases} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

Piecewise((I*b*x**(7/2)/(3*sqrt(b*x - 2)) - 5*I*x**(5/2)/(6*sqrt(b*x - 2)) - I*x**(3/2)/(6*b*sqrt(b*x - 2)) +
I*sqrt(x)/(b**2*sqrt(b*x - 2)) - I*acosh(sqrt(2)*sqrt(b)*sqrt(x)/2)/b**(5/2), Abs(b*x)/2 > 1), (-b*x**(7/2)/(3
*sqrt(-b*x + 2)) + 5*x**(5/2)/(6*sqrt(-b*x + 2)) + x**(3/2)/(6*b*sqrt(-b*x + 2)) - sqrt(x)/(b**2*sqrt(-b*x + 2
)) + asin(sqrt(2)*sqrt(b)*sqrt(x)/2)/b**(5/2), True))

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

Exception raised: NotImplementedError