3.478 \(\int x \sqrt {-9-4 x^2} \, dx\)

Optimal. Leaf size=15 \[ -\frac {1}{12} \left (-4 x^2-9\right )^{3/2} \]

[Out]

-1/12*(-4*x^2-9)^(3/2)

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Rubi [A]  time = 0.00, antiderivative size = 15, normalized size of antiderivative = 1.00, number of steps used = 1, number of rules used = 1, integrand size = 13, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.077, Rules used = {261} \[ -\frac {1}{12} \left (-4 x^2-9\right )^{3/2} \]

Antiderivative was successfully verified.

[In]

Int[x*Sqrt[-9 - 4*x^2],x]

[Out]

-(-9 - 4*x^2)^(3/2)/12

Rule 261

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

Rubi steps

\begin {align*} \int x \sqrt {-9-4 x^2} \, dx &=-\frac {1}{12} \left (-9-4 x^2\right )^{3/2}\\ \end {align*}

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Mathematica [A]  time = 0.00, size = 15, normalized size = 1.00 \[ -\frac {1}{12} \left (-4 x^2-9\right )^{3/2} \]

Antiderivative was successfully verified.

[In]

Integrate[x*Sqrt[-9 - 4*x^2],x]

[Out]

-1/12*(-9 - 4*x^2)^(3/2)

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fricas [A]  time = 0.99, size = 18, normalized size = 1.20 \[ \frac {1}{12} \, {\left (4 \, x^{2} + 9\right )} \sqrt {-4 \, x^{2} - 9} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x*(-4*x^2-9)^(1/2),x, algorithm="fricas")

[Out]

1/12*(4*x^2 + 9)*sqrt(-4*x^2 - 9)

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giac [A]  time = 1.08, size = 12, normalized size = 0.80 \[ \frac {1}{12} \, {\left (4 \, x^{2} + 9\right )}^{\frac {3}{2}} i \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x*(-4*x^2-9)^(1/2),x, algorithm="giac")

[Out]

1/12*(4*x^2 + 9)^(3/2)*i

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maple [A]  time = 0.00, size = 12, normalized size = 0.80 \[ -\frac {\left (-4 x^{2}-9\right )^{\frac {3}{2}}}{12} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((-4*x^2-9)^(1/2)*x,x)

[Out]

-1/12*(-4*x^2-9)^(3/2)

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maxima [A]  time = 1.31, size = 11, normalized size = 0.73 \[ -\frac {1}{12} \, {\left (-4 \, x^{2} - 9\right )}^{\frac {3}{2}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x*(-4*x^2-9)^(1/2),x, algorithm="maxima")

[Out]

-1/12*(-4*x^2 - 9)^(3/2)

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mupad [B]  time = 0.07, size = 11, normalized size = 0.73 \[ -\frac {{\left (-4\,x^2-9\right )}^{3/2}}{12} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x*(- 4*x^2 - 9)^(1/2),x)

[Out]

-(- 4*x^2 - 9)^(3/2)/12

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sympy [B]  time = 0.22, size = 31, normalized size = 2.07 \[ \frac {x^{2} \sqrt {- 4 x^{2} - 9}}{3} + \frac {3 \sqrt {- 4 x^{2} - 9}}{4} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x*(-4*x**2-9)**(1/2),x)

[Out]

x**2*sqrt(-4*x**2 - 9)/3 + 3*sqrt(-4*x**2 - 9)/4

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