Integrand size = 16, antiderivative size = 93 \[ \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx=-\frac {15}{4} a b \sqrt {x} \sqrt {a-b x}-\frac {5}{2} b \sqrt {x} (a-b x)^{3/2}-\frac {2 (a-b x)^{5/2}}{\sqrt {x}}-\frac {15}{4} a^2 \sqrt {b} \arctan \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a-b x}}\right ) \]
-15/4*a^2*arctan(b^(1/2)*x^(1/2)/(-b*x+a)^(1/2))*b^(1/2)-2*(-b*x+a)^(5/2)/ x^(1/2)-5/2*b*(-b*x+a)^(3/2)*x^(1/2)-15/4*a*b*x^(1/2)*(-b*x+a)^(1/2)
Time = 0.23 (sec) , antiderivative size = 83, normalized size of antiderivative = 0.89 \[ \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx=\frac {\sqrt {a-b x} \left (-8 a^2-9 a b x+2 b^2 x^2\right )}{4 \sqrt {x}}-\frac {15}{2} a^2 \sqrt {b} \arctan \left (\frac {\sqrt {b} \sqrt {x}}{-\sqrt {a}+\sqrt {a-b x}}\right ) \]
(Sqrt[a - b*x]*(-8*a^2 - 9*a*b*x + 2*b^2*x^2))/(4*Sqrt[x]) - (15*a^2*Sqrt[ b]*ArcTan[(Sqrt[b]*Sqrt[x])/(-Sqrt[a] + Sqrt[a - b*x])])/2
Time = 0.17 (sec) , antiderivative size = 92, normalized size of antiderivative = 0.99, number of steps used = 6, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.312, Rules used = {57, 60, 60, 65, 216}
Below are the steps used by Rubi to obtain the solution. The rule number used for the transformation is given above next to the arrow. The rules definitions used are listed below.
\(\displaystyle \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx\) |
\(\Big \downarrow \) 57 |
\(\displaystyle -5 b \int \frac {(a-b x)^{3/2}}{\sqrt {x}}dx-\frac {2 (a-b x)^{5/2}}{\sqrt {x}}\) |
\(\Big \downarrow \) 60 |
\(\displaystyle -5 b \left (\frac {3}{4} a \int \frac {\sqrt {a-b x}}{\sqrt {x}}dx+\frac {1}{2} \sqrt {x} (a-b x)^{3/2}\right )-\frac {2 (a-b x)^{5/2}}{\sqrt {x}}\) |
\(\Big \downarrow \) 60 |
\(\displaystyle -5 b \left (\frac {3}{4} a \left (\frac {1}{2} a \int \frac {1}{\sqrt {x} \sqrt {a-b x}}dx+\sqrt {x} \sqrt {a-b x}\right )+\frac {1}{2} \sqrt {x} (a-b x)^{3/2}\right )-\frac {2 (a-b x)^{5/2}}{\sqrt {x}}\) |
\(\Big \downarrow \) 65 |
\(\displaystyle -5 b \left (\frac {3}{4} a \left (a \int \frac {1}{\frac {b x}{a-b x}+1}d\frac {\sqrt {x}}{\sqrt {a-b x}}+\sqrt {x} \sqrt {a-b x}\right )+\frac {1}{2} \sqrt {x} (a-b x)^{3/2}\right )-\frac {2 (a-b x)^{5/2}}{\sqrt {x}}\) |
\(\Big \downarrow \) 216 |
\(\displaystyle -5 b \left (\frac {3}{4} a \left (\frac {a \arctan \left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a-b x}}\right )}{\sqrt {b}}+\sqrt {x} \sqrt {a-b x}\right )+\frac {1}{2} \sqrt {x} (a-b x)^{3/2}\right )-\frac {2 (a-b x)^{5/2}}{\sqrt {x}}\) |
(-2*(a - b*x)^(5/2))/Sqrt[x] - 5*b*((Sqrt[x]*(a - b*x)^(3/2))/2 + (3*a*(Sq rt[x]*Sqrt[a - b*x] + (a*ArcTan[(Sqrt[b]*Sqrt[x])/Sqrt[a - b*x]])/Sqrt[b]) )/4)
3.6.55.3.1 Defintions of rubi rules used
Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> Simp[ (a + b*x)^(m + 1)*((c + d*x)^n/(b*(m + 1))), x] - Simp[d*(n/(b*(m + 1))) Int[(a + b*x)^(m + 1)*(c + d*x)^(n - 1), x], x] /; FreeQ[{a, b, c, d}, x] & & GtQ[n, 0] && LtQ[m, -1] && !(IntegerQ[n] && !IntegerQ[m]) && !(ILeQ[m + n + 2, 0] && (FractionQ[m] || GeQ[2*n + m + 1, 0])) && IntLinearQ[a, b, c , d, m, n, x]
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] + Simp[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] && GtQ[n, 0] && NeQ[m + n + 1, 0] && !(IGtQ[m, 0] && ( !Integer Q[n] || (GtQ[m, 0] && LtQ[m - n, 0]))) && !ILtQ[m + n + 2, 0] && IntLinear Q[a, b, c, d, m, n, x]
Int[1/(Sqrt[(b_.)*(x_)]*Sqrt[(c_) + (d_.)*(x_)]), x_Symbol] :> Simp[2 Sub st[Int[1/(b - d*x^2), x], x, Sqrt[b*x]/Sqrt[c + d*x]], x] /; FreeQ[{b, c, d }, x] && !GtQ[c, 0]
Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1/(Rt[a, 2]*Rt[b, 2]))*A rcTan[Rt[b, 2]*(x/Rt[a, 2])], x] /; FreeQ[{a, b}, x] && PosQ[a/b] && (GtQ[a , 0] || GtQ[b, 0])
Time = 0.09 (sec) , antiderivative size = 88, normalized size of antiderivative = 0.95
method | result | size |
risch | \(-\frac {\sqrt {-b x +a}\, \left (-2 b^{2} x^{2}+9 a b x +8 a^{2}\right )}{4 \sqrt {x}}-\frac {15 a^{2} \sqrt {b}\, \arctan \left (\frac {\sqrt {b}\, \left (x -\frac {a}{2 b}\right )}{\sqrt {-b \,x^{2}+a x}}\right ) \sqrt {x \left (-b x +a \right )}}{8 \sqrt {x}\, \sqrt {-b x +a}}\) | \(88\) |
-1/4*(-b*x+a)^(1/2)*(-2*b^2*x^2+9*a*b*x+8*a^2)/x^(1/2)-15/8*a^2*b^(1/2)*ar ctan(b^(1/2)*(x-1/2*a/b)/(-b*x^2+a*x)^(1/2))*(x*(-b*x+a))^(1/2)/x^(1/2)/(- b*x+a)^(1/2)
Time = 0.24 (sec) , antiderivative size = 137, normalized size of antiderivative = 1.47 \[ \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx=\left [\frac {15 \, a^{2} \sqrt {-b} x \log \left (-2 \, b x + 2 \, \sqrt {-b x + a} \sqrt {-b} \sqrt {x} + a\right ) + 2 \, {\left (2 \, b^{2} x^{2} - 9 \, a b x - 8 \, a^{2}\right )} \sqrt {-b x + a} \sqrt {x}}{8 \, x}, \frac {15 \, a^{2} \sqrt {b} x \arctan \left (\frac {\sqrt {-b x + a}}{\sqrt {b} \sqrt {x}}\right ) + {\left (2 \, b^{2} x^{2} - 9 \, a b x - 8 \, a^{2}\right )} \sqrt {-b x + a} \sqrt {x}}{4 \, x}\right ] \]
[1/8*(15*a^2*sqrt(-b)*x*log(-2*b*x + 2*sqrt(-b*x + a)*sqrt(-b)*sqrt(x) + a ) + 2*(2*b^2*x^2 - 9*a*b*x - 8*a^2)*sqrt(-b*x + a)*sqrt(x))/x, 1/4*(15*a^2 *sqrt(b)*x*arctan(sqrt(-b*x + a)/(sqrt(b)*sqrt(x))) + (2*b^2*x^2 - 9*a*b*x - 8*a^2)*sqrt(-b*x + a)*sqrt(x))/x]
Result contains complex when optimal does not.
Time = 5.09 (sec) , antiderivative size = 267, normalized size of antiderivative = 2.87 \[ \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx=\begin {cases} \frac {2 i a^{\frac {5}{2}}}{\sqrt {x} \sqrt {-1 + \frac {b x}{a}}} + \frac {i a^{\frac {3}{2}} b \sqrt {x}}{4 \sqrt {-1 + \frac {b x}{a}}} - \frac {11 i \sqrt {a} b^{2} x^{\frac {3}{2}}}{4 \sqrt {-1 + \frac {b x}{a}}} + \frac {15 i a^{2} \sqrt {b} \operatorname {acosh}{\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a}} \right )}}{4} + \frac {i b^{3} x^{\frac {5}{2}}}{2 \sqrt {a} \sqrt {-1 + \frac {b x}{a}}} & \text {for}\: \left |{\frac {b x}{a}}\right | > 1 \\- \frac {2 a^{\frac {5}{2}}}{\sqrt {x} \sqrt {1 - \frac {b x}{a}}} - \frac {a^{\frac {3}{2}} b \sqrt {x}}{4 \sqrt {1 - \frac {b x}{a}}} + \frac {11 \sqrt {a} b^{2} x^{\frac {3}{2}}}{4 \sqrt {1 - \frac {b x}{a}}} - \frac {15 a^{2} \sqrt {b} \operatorname {asin}{\left (\frac {\sqrt {b} \sqrt {x}}{\sqrt {a}} \right )}}{4} - \frac {b^{3} x^{\frac {5}{2}}}{2 \sqrt {a} \sqrt {1 - \frac {b x}{a}}} & \text {otherwise} \end {cases} \]
Piecewise((2*I*a**(5/2)/(sqrt(x)*sqrt(-1 + b*x/a)) + I*a**(3/2)*b*sqrt(x)/ (4*sqrt(-1 + b*x/a)) - 11*I*sqrt(a)*b**2*x**(3/2)/(4*sqrt(-1 + b*x/a)) + 1 5*I*a**2*sqrt(b)*acosh(sqrt(b)*sqrt(x)/sqrt(a))/4 + I*b**3*x**(5/2)/(2*sqr t(a)*sqrt(-1 + b*x/a)), Abs(b*x/a) > 1), (-2*a**(5/2)/(sqrt(x)*sqrt(1 - b* x/a)) - a**(3/2)*b*sqrt(x)/(4*sqrt(1 - b*x/a)) + 11*sqrt(a)*b**2*x**(3/2)/ (4*sqrt(1 - b*x/a)) - 15*a**2*sqrt(b)*asin(sqrt(b)*sqrt(x)/sqrt(a))/4 - b* *3*x**(5/2)/(2*sqrt(a)*sqrt(1 - b*x/a)), True))
Time = 0.29 (sec) , antiderivative size = 112, normalized size of antiderivative = 1.20 \[ \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx=\frac {15}{4} \, a^{2} \sqrt {b} \arctan \left (\frac {\sqrt {-b x + a}}{\sqrt {b} \sqrt {x}}\right ) - \frac {2 \, \sqrt {-b x + a} a^{2}}{\sqrt {x}} - \frac {\frac {7 \, \sqrt {-b x + a} a^{2} b^{2}}{\sqrt {x}} + \frac {9 \, {\left (-b x + a\right )}^{\frac {3}{2}} a^{2} b}{x^{\frac {3}{2}}}}{4 \, {\left (b^{2} - \frac {2 \, {\left (b x - a\right )} b}{x} + \frac {{\left (b x - a\right )}^{2}}{x^{2}}\right )}} \]
15/4*a^2*sqrt(b)*arctan(sqrt(-b*x + a)/(sqrt(b)*sqrt(x))) - 2*sqrt(-b*x + a)*a^2/sqrt(x) - 1/4*(7*sqrt(-b*x + a)*a^2*b^2/sqrt(x) + 9*(-b*x + a)^(3/2 )*a^2*b/x^(3/2))/(b^2 - 2*(b*x - a)*b/x + (b*x - a)^2/x^2)
Time = 76.10 (sec) , antiderivative size = 100, normalized size of antiderivative = 1.08 \[ \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx=-\frac {{\left (\frac {15 \, a^{2} \log \left ({\left | -\sqrt {-b x + a} \sqrt {-b} + \sqrt {{\left (b x - a\right )} b + a b} \right |}\right )}{\sqrt {-b}} - \frac {{\left ({\left (2 \, b x - 7 \, a\right )} {\left (b x - a\right )} - 15 \, a^{2}\right )} \sqrt {-b x + a}}{\sqrt {{\left (b x - a\right )} b + a b}}\right )} b^{2}}{4 \, {\left | b \right |}} \]
-1/4*(15*a^2*log(abs(-sqrt(-b*x + a)*sqrt(-b) + sqrt((b*x - a)*b + a*b)))/ sqrt(-b) - ((2*b*x - 7*a)*(b*x - a) - 15*a^2)*sqrt(-b*x + a)/sqrt((b*x - a )*b + a*b))*b^2/abs(b)
Timed out. \[ \int \frac {(a-b x)^{5/2}}{x^{3/2}} \, dx=\int \frac {{\left (a-b\,x\right )}^{5/2}}{x^{3/2}} \,d x \]