3.430 \(\int \frac {A+B x}{x^3 \sqrt {a+b x}} \, dx\)

Optimal. Leaf size=84 \[ -\frac {b (3 A b-4 a B) \tanh ^{-1}\left (\frac {\sqrt {a+b x}}{\sqrt {a}}\right )}{4 a^{5/2}}+\frac {\sqrt {a+b x} (3 A b-4 a B)}{4 a^2 x}-\frac {A \sqrt {a+b x}}{2 a x^2} \]

[Out]

-1/4*b*(3*A*b-4*B*a)*arctanh((b*x+a)^(1/2)/a^(1/2))/a^(5/2)-1/2*A*(b*x+a)^(1/2)/a/x^2+1/4*(3*A*b-4*B*a)*(b*x+a
)^(1/2)/a^2/x

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Rubi [A]  time = 0.03, antiderivative size = 84, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, integrand size = 18, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.222, Rules used = {78, 51, 63, 208} \[ \frac {\sqrt {a+b x} (3 A b-4 a B)}{4 a^2 x}-\frac {b (3 A b-4 a B) \tanh ^{-1}\left (\frac {\sqrt {a+b x}}{\sqrt {a}}\right )}{4 a^{5/2}}-\frac {A \sqrt {a+b x}}{2 a x^2} \]

Antiderivative was successfully verified.

[In]

Int[(A + B*x)/(x^3*Sqrt[a + b*x]),x]

[Out]

-(A*Sqrt[a + b*x])/(2*a*x^2) + ((3*A*b - 4*a*B)*Sqrt[a + b*x])/(4*a^2*x) - (b*(3*A*b - 4*a*B)*ArcTanh[Sqrt[a +
b*x]/Sqrt[a]])/(4*a^(5/2))

Rule 51

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

Rule 63

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> With[{p = Denominator[m]}, Dist[p/b, Sub
st[Int[x^(p*(m + 1) - 1)*(c - (a*d)/b + (d*x^p)/b)^n, x], x, (a + b*x)^(1/p)], x]] /; FreeQ[{a, b, c, d}, x] &
& NeQ[b*c - a*d, 0] && LtQ[-1, m, 0] && LeQ[-1, n, 0] && LeQ[Denominator[n], Denominator[m]] && IntLinearQ[a,
b, c, d, m, n, x]

Rule 78

Int[((a_.) + (b_.)*(x_))*((c_.) + (d_.)*(x_))^(n_.)*((e_.) + (f_.)*(x_))^(p_.), x_Symbol] :> -Simp[((b*e - a*f
)*(c + d*x)^(n + 1)*(e + f*x)^(p + 1))/(f*(p + 1)*(c*f - d*e)), x] - Dist[(a*d*f*(n + p + 2) - b*(d*e*(n + 1)
+ c*f*(p + 1)))/(f*(p + 1)*(c*f - d*e)), Int[(c + d*x)^n*(e + f*x)^(p + 1), x], x] /; FreeQ[{a, b, c, d, e, f,
n}, x] && LtQ[p, -1] && ( !LtQ[n, -1] || IntegerQ[p] ||  !(IntegerQ[n] ||  !(EqQ[e, 0] ||  !(EqQ[c, 0] || LtQ
[p, n]))))

Rule 208

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

Rubi steps

\begin {align*} \int \frac {A+B x}{x^3 \sqrt {a+b x}} \, dx &=-\frac {A \sqrt {a+b x}}{2 a x^2}+\frac {\left (-\frac {3 A b}{2}+2 a B\right ) \int \frac {1}{x^2 \sqrt {a+b x}} \, dx}{2 a}\\ &=-\frac {A \sqrt {a+b x}}{2 a x^2}+\frac {(3 A b-4 a B) \sqrt {a+b x}}{4 a^2 x}+\frac {(b (3 A b-4 a B)) \int \frac {1}{x \sqrt {a+b x}} \, dx}{8 a^2}\\ &=-\frac {A \sqrt {a+b x}}{2 a x^2}+\frac {(3 A b-4 a B) \sqrt {a+b x}}{4 a^2 x}+\frac {(3 A b-4 a B) \operatorname {Subst}\left (\int \frac {1}{-\frac {a}{b}+\frac {x^2}{b}} \, dx,x,\sqrt {a+b x}\right )}{4 a^2}\\ &=-\frac {A \sqrt {a+b x}}{2 a x^2}+\frac {(3 A b-4 a B) \sqrt {a+b x}}{4 a^2 x}-\frac {b (3 A b-4 a B) \tanh ^{-1}\left (\frac {\sqrt {a+b x}}{\sqrt {a}}\right )}{4 a^{5/2}}\\ \end {align*}

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Mathematica [A]  time = 0.21, size = 73, normalized size = 0.87 \[ \frac {\sqrt {a+b x} \left (\frac {a (3 A b x-2 a (A+2 B x))}{x^2}+\frac {b (4 a B-3 A b) \tanh ^{-1}\left (\sqrt {\frac {b x}{a}+1}\right )}{\sqrt {\frac {b x}{a}+1}}\right )}{4 a^3} \]

Antiderivative was successfully verified.

[In]

Integrate[(A + B*x)/(x^3*Sqrt[a + b*x]),x]

[Out]

(Sqrt[a + b*x]*((a*(3*A*b*x - 2*a*(A + 2*B*x)))/x^2 + (b*(-3*A*b + 4*a*B)*ArcTanh[Sqrt[1 + (b*x)/a]])/Sqrt[1 +
(b*x)/a]))/(4*a^3)

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fricas [A]  time = 0.69, size = 159, normalized size = 1.89 \[ \left [-\frac {{\left (4 \, B a b - 3 \, A b^{2}\right )} \sqrt {a} x^{2} \log \left (\frac {b x - 2 \, \sqrt {b x + a} \sqrt {a} + 2 \, a}{x}\right ) + 2 \, {\left (2 \, A a^{2} + {\left (4 \, B a^{2} - 3 \, A a b\right )} x\right )} \sqrt {b x + a}}{8 \, a^{3} x^{2}}, -\frac {{\left (4 \, B a b - 3 \, A b^{2}\right )} \sqrt {-a} x^{2} \arctan \left (\frac {\sqrt {b x + a} \sqrt {-a}}{a}\right ) + {\left (2 \, A a^{2} + {\left (4 \, B a^{2} - 3 \, A a b\right )} x\right )} \sqrt {b x + a}}{4 \, a^{3} x^{2}}\right ] \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

[-1/8*((4*B*a*b - 3*A*b^2)*sqrt(a)*x^2*log((b*x - 2*sqrt(b*x + a)*sqrt(a) + 2*a)/x) + 2*(2*A*a^2 + (4*B*a^2 -
3*A*a*b)*x)*sqrt(b*x + a))/(a^3*x^2), -1/4*((4*B*a*b - 3*A*b^2)*sqrt(-a)*x^2*arctan(sqrt(b*x + a)*sqrt(-a)/a)
+ (2*A*a^2 + (4*B*a^2 - 3*A*a*b)*x)*sqrt(b*x + a))/(a^3*x^2)]

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giac [A]  time = 1.31, size = 111, normalized size = 1.32 \[ -\frac {\frac {{\left (4 \, B a b^{2} - 3 \, A b^{3}\right )} \arctan \left (\frac {\sqrt {b x + a}}{\sqrt {-a}}\right )}{\sqrt {-a} a^{2}} + \frac {4 \, {\left (b x + a\right )}^{\frac {3}{2}} B a b^{2} - 4 \, \sqrt {b x + a} B a^{2} b^{2} - 3 \, {\left (b x + a\right )}^{\frac {3}{2}} A b^{3} + 5 \, \sqrt {b x + a} A a b^{3}}{a^{2} b^{2} x^{2}}}{4 \, b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/4*((4*B*a*b^2 - 3*A*b^3)*arctan(sqrt(b*x + a)/sqrt(-a))/(sqrt(-a)*a^2) + (4*(b*x + a)^(3/2)*B*a*b^2 - 4*sqr
t(b*x + a)*B*a^2*b^2 - 3*(b*x + a)^(3/2)*A*b^3 + 5*sqrt(b*x + a)*A*a*b^3)/(a^2*b^2*x^2))/b

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maple [A]  time = 0.01, size = 81, normalized size = 0.96 \[ 2 \left (-\frac {\left (3 A b -4 B a \right ) \arctanh \left (\frac {\sqrt {b x +a}}{\sqrt {a}}\right )}{8 a^{\frac {5}{2}}}+\frac {-\frac {\left (5 A b -4 B a \right ) \sqrt {b x +a}}{8 a}+\frac {\left (3 A b -4 B a \right ) \left (b x +a \right )^{\frac {3}{2}}}{8 a^{2}}}{b^{2} x^{2}}\right ) b \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((B*x+A)/x^3/(b*x+a)^(1/2),x)

[Out]

2*b*((1/8*(3*A*b-4*B*a)/a^2*(b*x+a)^(3/2)-1/8*(5*A*b-4*B*a)/a*(b*x+a)^(1/2))/x^2/b^2-1/8*(3*A*b-4*B*a)/a^(5/2)
*arctanh((b*x+a)^(1/2)/a^(1/2)))

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maxima [A]  time = 1.88, size = 122, normalized size = 1.45 \[ -\frac {1}{8} \, b^{2} {\left (\frac {2 \, {\left ({\left (4 \, B a - 3 \, A b\right )} {\left (b x + a\right )}^{\frac {3}{2}} - {\left (4 \, B a^{2} - 5 \, A a b\right )} \sqrt {b x + a}\right )}}{{\left (b x + a\right )}^{2} a^{2} b - 2 \, {\left (b x + a\right )} a^{3} b + a^{4} b} + \frac {{\left (4 \, B a - 3 \, A b\right )} \log \left (\frac {\sqrt {b x + a} - \sqrt {a}}{\sqrt {b x + a} + \sqrt {a}}\right )}{a^{\frac {5}{2}} b}\right )} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/8*b^2*(2*((4*B*a - 3*A*b)*(b*x + a)^(3/2) - (4*B*a^2 - 5*A*a*b)*sqrt(b*x + a))/((b*x + a)^2*a^2*b - 2*(b*x
+ a)*a^3*b + a^4*b) + (4*B*a - 3*A*b)*log((sqrt(b*x + a) - sqrt(a))/(sqrt(b*x + a) + sqrt(a)))/(a^(5/2)*b))

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mupad [B]  time = 0.12, size = 100, normalized size = 1.19 \[ -\frac {\frac {\left (5\,A\,b^2-4\,B\,a\,b\right )\,\sqrt {a+b\,x}}{4\,a}-\frac {\left (3\,A\,b^2-4\,B\,a\,b\right )\,{\left (a+b\,x\right )}^{3/2}}{4\,a^2}}{{\left (a+b\,x\right )}^2-2\,a\,\left (a+b\,x\right )+a^2}-\frac {b\,\mathrm {atanh}\left (\frac {\sqrt {a+b\,x}}{\sqrt {a}}\right )\,\left (3\,A\,b-4\,B\,a\right )}{4\,a^{5/2}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((A + B*x)/(x^3*(a + b*x)^(1/2)),x)

[Out]

- (((5*A*b^2 - 4*B*a*b)*(a + b*x)^(1/2))/(4*a) - ((3*A*b^2 - 4*B*a*b)*(a + b*x)^(3/2))/(4*a^2))/((a + b*x)^2 -
2*a*(a + b*x) + a^2) - (b*atanh((a + b*x)^(1/2)/a^(1/2))*(3*A*b - 4*B*a))/(4*a^(5/2))

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sympy [B]  time = 65.16, size = 156, normalized size = 1.86 \[ - \frac {A}{2 \sqrt {b} x^{\frac {5}{2}} \sqrt {\frac {a}{b x} + 1}} + \frac {A \sqrt {b}}{4 a x^{\frac {3}{2}} \sqrt {\frac {a}{b x} + 1}} + \frac {3 A b^{\frac {3}{2}}}{4 a^{2} \sqrt {x} \sqrt {\frac {a}{b x} + 1}} - \frac {3 A b^{2} \operatorname {asinh}{\left (\frac {\sqrt {a}}{\sqrt {b} \sqrt {x}} \right )}}{4 a^{\frac {5}{2}}} - \frac {B \sqrt {b} \sqrt {\frac {a}{b x} + 1}}{a \sqrt {x}} + \frac {B b \operatorname {asinh}{\left (\frac {\sqrt {a}}{\sqrt {b} \sqrt {x}} \right )}}{a^{\frac {3}{2}}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((B*x+A)/x**3/(b*x+a)**(1/2),x)

[Out]

-A/(2*sqrt(b)*x**(5/2)*sqrt(a/(b*x) + 1)) + A*sqrt(b)/(4*a*x**(3/2)*sqrt(a/(b*x) + 1)) + 3*A*b**(3/2)/(4*a**2*
sqrt(x)*sqrt(a/(b*x) + 1)) - 3*A*b**2*asinh(sqrt(a)/(sqrt(b)*sqrt(x)))/(4*a**(5/2)) - B*sqrt(b)*sqrt(a/(b*x) +
1)/(a*sqrt(x)) + B*b*asinh(sqrt(a)/(sqrt(b)*sqrt(x)))/a**(3/2)

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