Internal problem ID [4284]
Book: Ordinary differential equations and their solutions. By George Moseley Murphy.
1960
Section: Various 36
Problem number: 1064.
ODE order: 1.
ODE degree: 3.
CAS Maple gives this as type [[_1st_order, _with_linear_symmetries], _dAlembert]
\[ \boxed {8 x {y^{\prime }}^{3}-12 y {y^{\prime }}^{2}+9 y=0} \]
✓ Solution by Maple
Time used: 0.032 (sec). Leaf size: 61
dsolve(8*x*diff(y(x),x)^3-12*y(x)*diff(y(x),x)^2+9*y(x) = 0,y(x), singsol=all)
\begin{align*} y \left (x \right ) &= -\frac {3 x}{2} \\ y \left (x \right ) &= \frac {3 x}{2} \\ y \left (x \right ) &= 0 \\ y \left (x \right ) &= -\frac {\left (3 c_{1} +x \right ) \sqrt {c_{1} \left (3 c_{1} +x \right )}}{3 c_{1}} \\ y \left (x \right ) &= \frac {\left (3 c_{1} +x \right ) \sqrt {c_{1} \left (3 c_{1} +x \right )}}{3 c_{1}} \\ \end{align*}
✓ Solution by Mathematica
Time used: 0.453 (sec). Leaf size: 77
DSolve[8 x (y'[x])^3 -12 y[x] (y'[x])^2 + 9 y[x]==0,y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to -\frac {(x+3 c_1){}^{3/2}}{3 \sqrt {c_1}} \\ y(x)\to \frac {(x+3 c_1){}^{3/2}}{3 \sqrt {c_1}} \\ y(x)\to 0 \\ y(x)\to \text {Indeterminate} \\ y(x)\to -\frac {3 x}{2} \\ y(x)\to \frac {3 x}{2} \\ \end{align*}