\(\int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx\) [782]

Optimal result

Integrand size = 31, antiderivative size = 120 \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\frac {2 a A x^{9/2} \sqrt {a^2+2 a b x+b^2 x^2}}{9 (a+b x)}+\frac {2 (A b+a B) x^{11/2} \sqrt {a^2+2 a b x+b^2 x^2}}{11 (a+b x)}+\frac {2 b B x^{13/2} \sqrt {a^2+2 a b x+b^2 x^2}}{13 (a+b x)} \]

[Out]

2/9*a*A*x^(9/2)*((b*x+a)^2)^(1/2)/(b*x+a)+2/11*(A*b+B*a)*x^(11/2)*((b*x+a)^2)^(1/2)/(b*x+a)+2/13*b*B*x^(13/2)*
((b*x+a)^2)^(1/2)/(b*x+a)

Rubi [A] (verified)

Time = 0.03 (sec) , antiderivative size = 120, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.065, Rules used = {784, 77} \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\frac {2 x^{11/2} \sqrt {a^2+2 a b x+b^2 x^2} (a B+A b)}{11 (a+b x)}+\frac {2 a A x^{9/2} \sqrt {a^2+2 a b x+b^2 x^2}}{9 (a+b x)}+\frac {2 b B x^{13/2} \sqrt {a^2+2 a b x+b^2 x^2}}{13 (a+b x)} \]

[In]

Int[x^(7/2)*(A + B*x)*Sqrt[a^2 + 2*a*b*x + b^2*x^2],x]

[Out]

(2*a*A*x^(9/2)*Sqrt[a^2 + 2*a*b*x + b^2*x^2])/(9*(a + b*x)) + (2*(A*b + a*B)*x^(11/2)*Sqrt[a^2 + 2*a*b*x + b^2
*x^2])/(11*(a + b*x)) + (2*b*B*x^(13/2)*Sqrt[a^2 + 2*a*b*x + b^2*x^2])/(13*(a + b*x))

Rule 77

Int[((d_.)*(x_))^(n_.)*((a_) + (b_.)*(x_))*((e_) + (f_.)*(x_))^(p_.), x_Symbol] :> Int[ExpandIntegrand[(a + b*
x)*(d*x)^n*(e + f*x)^p, x], x] /; FreeQ[{a, b, d, e, f, n}, x] && IGtQ[p, 0] && (NeQ[n, -1] || EqQ[p, 1]) && N
eQ[b*e + a*f, 0] && ( !IntegerQ[n] || LtQ[9*p + 5*n, 0] || GeQ[n + p + 1, 0] || (GeQ[n + p + 2, 0] && Rational
Q[a, b, d, e, f])) && (NeQ[n + p + 3, 0] || EqQ[p, 1])

Rule 784

Int[((d_.) + (e_.)*(x_))^(m_.)*((f_.) + (g_.)*(x_))*((a_.) + (b_.)*(x_) + (c_.)*(x_)^2)^(p_), x_Symbol] :> Dis
t[(a + b*x + c*x^2)^FracPart[p]/(c^IntPart[p]*(b/2 + c*x)^(2*FracPart[p])), Int[(d + e*x)^m*(f + g*x)*(b/2 + c
*x)^(2*p), x], x] /; FreeQ[{a, b, c, d, e, f, g, m}, x] && EqQ[b^2 - 4*a*c, 0]

Rubi steps \begin{align*} \text {integral}& = \frac {\sqrt {a^2+2 a b x+b^2 x^2} \int x^{7/2} \left (a b+b^2 x\right ) (A+B x) \, dx}{a b+b^2 x} \\ & = \frac {\sqrt {a^2+2 a b x+b^2 x^2} \int \left (a A b x^{7/2}+b (A b+a B) x^{9/2}+b^2 B x^{11/2}\right ) \, dx}{a b+b^2 x} \\ & = \frac {2 a A x^{9/2} \sqrt {a^2+2 a b x+b^2 x^2}}{9 (a+b x)}+\frac {2 (A b+a B) x^{11/2} \sqrt {a^2+2 a b x+b^2 x^2}}{11 (a+b x)}+\frac {2 b B x^{13/2} \sqrt {a^2+2 a b x+b^2 x^2}}{13 (a+b x)} \\ \end{align*}

Mathematica [A] (verified)

Time = 0.02 (sec) , antiderivative size = 49, normalized size of antiderivative = 0.41 \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\frac {2 x^{9/2} \sqrt {(a+b x)^2} \left (143 a A+117 A b x+117 a B x+99 b B x^2\right )}{1287 (a+b x)} \]

[In]

Integrate[x^(7/2)*(A + B*x)*Sqrt[a^2 + 2*a*b*x + b^2*x^2],x]

[Out]

(2*x^(9/2)*Sqrt[(a + b*x)^2]*(143*a*A + 117*A*b*x + 117*a*B*x + 99*b*B*x^2))/(1287*(a + b*x))

Maple [C] (warning: unable to verify)

Result contains higher order function than in optimal. Order 9 vs. order 2.

Time = 0.13 (sec) , antiderivative size = 34, normalized size of antiderivative = 0.28

method	result	size
default	\(\frac {2 \,\operatorname {csgn}\left (b x +a \right ) x^{\frac {9}{2}} \left (99 B b \,x^{2}+117 A b x +117 a B x +143 a A \right )}{1287}\)	\(34\)
gosper	\(\frac {2 x^{\frac {9}{2}} \left (99 B b \,x^{2}+117 A b x +117 a B x +143 a A \right ) \sqrt {\left (b x +a \right )^{2}}}{1287 \left (b x +a \right )}\)	\(44\)
risch	\(\frac {2 x^{\frac {9}{2}} \left (99 B b \,x^{2}+117 A b x +117 a B x +143 a A \right ) \sqrt {\left (b x +a \right )^{2}}}{1287 \left (b x +a \right )}\)	\(44\)

[In]

int(x^(7/2)*(B*x+A)*((b*x+a)^2)^(1/2),x,method=_RETURNVERBOSE)

[Out]

2/1287*csgn(b*x+a)*x^(9/2)*(99*B*b*x^2+117*A*b*x+117*B*a*x+143*A*a)

Fricas [A] (verification not implemented)

none

Time = 0.36 (sec) , antiderivative size = 32, normalized size of antiderivative = 0.27 \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\frac {2}{1287} \, {\left (99 \, B b x^{6} + 143 \, A a x^{4} + 117 \, {\left (B a + A b\right )} x^{5}\right )} \sqrt {x} \]

[In]

integrate(x^(7/2)*(B*x+A)*((b*x+a)^2)^(1/2),x, algorithm="fricas")

[Out]

2/1287*(99*B*b*x^6 + 143*A*a*x^4 + 117*(B*a + A*b)*x^5)*sqrt(x)

Sympy [F(-1)]

Timed out. \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\text {Timed out} \]

[In]

integrate(x**(7/2)*(B*x+A)*((b*x+a)**2)**(1/2),x)

[Out]

Timed out

Maxima [A] (verification not implemented)

none

Time = 0.21 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.29 \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\frac {2}{143} \, {\left (11 \, b x^{2} + 13 \, a x\right )} B x^{\frac {9}{2}} + \frac {2}{99} \, {\left (9 \, b x^{2} + 11 \, a x\right )} A x^{\frac {7}{2}} \]

[In]

integrate(x^(7/2)*(B*x+A)*((b*x+a)^2)^(1/2),x, algorithm="maxima")

[Out]

2/143*(11*b*x^2 + 13*a*x)*B*x^(9/2) + 2/99*(9*b*x^2 + 11*a*x)*A*x^(7/2)

Giac [A] (verification not implemented)

none

Time = 0.27 (sec) , antiderivative size = 53, normalized size of antiderivative = 0.44 \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\frac {2}{13} \, B b x^{\frac {13}{2}} \mathrm {sgn}\left (b x + a\right ) + \frac {2}{11} \, B a x^{\frac {11}{2}} \mathrm {sgn}\left (b x + a\right ) + \frac {2}{11} \, A b x^{\frac {11}{2}} \mathrm {sgn}\left (b x + a\right ) + \frac {2}{9} \, A a x^{\frac {9}{2}} \mathrm {sgn}\left (b x + a\right ) \]

[In]

integrate(x^(7/2)*(B*x+A)*((b*x+a)^2)^(1/2),x, algorithm="giac")

[Out]

2/13*B*b*x^(13/2)*sgn(b*x + a) + 2/11*B*a*x^(11/2)*sgn(b*x + a) + 2/11*A*b*x^(11/2)*sgn(b*x + a) + 2/9*A*a*x^(
9/2)*sgn(b*x + a)

Mupad [F(-1)]

Timed out. \[ \int x^{7/2} (A+B x) \sqrt {a^2+2 a b x+b^2 x^2} \, dx=\int x^{7/2}\,\sqrt {{\left (a+b\,x\right )}^2}\,\left (A+B\,x\right ) \,d x \]

[In]

int(x^(7/2)*((a + b*x)^2)^(1/2)*(A + B*x),x)

[Out]

int(x^(7/2)*((a + b*x)^2)^(1/2)*(A + B*x), x)