Internal problem ID [4103]
Book: Ordinary differential equations and their solutions. By George Moseley Murphy.
1960
Section: Various 30
Problem number: 865.
ODE order: 1.
ODE degree: 2.
CAS Maple gives this as type [[_homogeneous, `class G`], _rational, _dAlembert]
\[ \boxed {{y^{\prime }}^{2} x -2 y y^{\prime }=-a} \]
✓ Solution by Maple
Time used: 0.079 (sec). Leaf size: 796
dsolve(x*diff(y(x),x)^2-2*y(x)*diff(y(x),x)+a = 0,y(x), singsol=all)
\begin{align*} y \left (x \right ) &= \frac {\left (\frac {4 x^{2}}{\left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}}+2 x +\left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}\right ) x}{12 c_{1}}+\frac {3 a c_{1} \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}}{\left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {2}{3}}+2 x \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}+4 x^{2}} \\ y \left (x \right ) &= -\frac {x \left (\left (1+i \sqrt {3}\right ) \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {2}{3}}-4 x \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}-4 x^{2} \left (i \sqrt {3}-1\right )\right )}{24 \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}} c_{1}}+\frac {6 a c_{1} \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}}{4 i \sqrt {3}\, x^{2}-i \sqrt {3}\, \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {2}{3}}-4 x^{2}+4 x \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}-\left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {2}{3}}} \\ y \left (x \right ) &= \frac {\left (\left (i \sqrt {3}-1\right ) \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {2}{3}}+4 x \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}-4 x^{2} \left (1+i \sqrt {3}\right )\right ) x}{24 \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}} c_{1}}-\frac {6 a c_{1} \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}}{4 i \sqrt {3}\, x^{2}-i \sqrt {3}\, \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {2}{3}}+4 x^{2}-4 x \left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {1}{3}}+\left (-36 c_{1}^{2} a +8 x^{3}+12 \sqrt {a \left (9 c_{1}^{2} a -4 x^{3}\right )}\, c_{1} \right )^{\frac {2}{3}}} \\ \end{align*}
✓ Solution by Mathematica
Time used: 60.165 (sec). Leaf size: 1553
DSolve[x (y'[x])^2-2 y[x] y'[x]+a==0,y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to \frac {e^{-\frac {3 c_1}{2}} \left (a^4 x^4+\left (-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}\right ){}^{2/3}-a^2 x^2 \sqrt [3]{-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}}+8 a e^{3 c_1} x\right )}{4 \sqrt [3]{-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}}} \\ y(x)\to \frac {i e^{-\frac {3 c_1}{2}} \left (-\left (\left (\sqrt {3}-i\right ) a^4 x^4\right )+\left (\sqrt {3}+i\right ) \left (-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}\right ){}^{2/3}+2 i a^2 x^2 \sqrt [3]{-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}}-8 \left (\sqrt {3}-i\right ) a e^{3 c_1} x\right )}{8 \sqrt [3]{-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}}} \\ y(x)\to \frac {e^{-\frac {3 c_1}{2}} \left (i \left (\sqrt {3}+i\right ) a^4 x^4-i \left (\sqrt {3}-i\right ) \left (-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}\right ){}^{2/3}-2 a^2 x^2 \sqrt [3]{-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}}+8 i \left (\sqrt {3}+i\right ) a e^{3 c_1} x\right )}{8 \sqrt [3]{-a^6 x^6+20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}+8 e^{6 c_1}}} \\ y(x)\to \frac {e^{-\frac {3 c_1}{2}} \left (a^4 x^4+\left (a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}\right ){}^{2/3}+a^2 x^2 \sqrt [3]{a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}}+8 a e^{3 c_1} x\right )}{4 \sqrt [3]{a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}}} \\ y(x)\to \frac {e^{-\frac {3 c_1}{2}} \left (\left (-1-i \sqrt {3}\right ) a^4 x^4+i \left (\sqrt {3}+i\right ) \left (a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}\right ){}^{2/3}+2 a^2 x^2 \sqrt [3]{a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}}-8 i \left (\sqrt {3}-i\right ) a e^{3 c_1} x\right )}{8 \sqrt [3]{a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}}} \\ y(x)\to \frac {e^{-\frac {3 c_1}{2}} \left (i \left (\sqrt {3}+i\right ) a^4 x^4-i \left (\sqrt {3}-i\right ) \left (a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}\right ){}^{2/3}+2 a^2 x^2 \sqrt [3]{a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}}+8 i \left (\sqrt {3}+i\right ) a e^{3 c_1} x\right )}{8 \sqrt [3]{a^6 x^6-20 a^3 e^{3 c_1} x^3+8 \sqrt {e^{3 c_1} \left (-a^3 x^3+e^{3 c_1}\right ){}^3}-8 e^{6 c_1}}} \\ \end{align*}