1.51 problem 51

Internal problem ID [7367]

Book: First order enumerated odes
Section: section 1
Problem number: 51.
ODE order: 1.
ODE degree: 2.

CAS Maple gives this as type [[_homogeneous, `class A`], _rational, _dAlembert]

\[ \boxed {{y^{\prime }}^{2}-\frac {y}{x}=0} \]

Solution by Maple

Time used: 0.015 (sec). Leaf size: 39

dsolve(diff(y(x),x)^2=y(x)/x,y(x), singsol=all)
 

\begin{align*} y \left (x \right ) &= 0 \\ y \left (x \right ) &= \frac {\left (x +\sqrt {c_{1} x}\right )^{2}}{x} \\ y \left (x \right ) &= \frac {\left (-x +\sqrt {c_{1} x}\right )^{2}}{x} \\ \end{align*}

Solution by Mathematica

Time used: 0.048 (sec). Leaf size: 46

DSolve[(y'[x])^2==y[x]/x,y[x],x,IncludeSingularSolutions -> True]
                                                                                    
                                                                                    
 

\begin{align*} y(x)\to \frac {1}{4} \left (-2 \sqrt {x}+c_1\right ){}^2 \\ y(x)\to \frac {1}{4} \left (2 \sqrt {x}+c_1\right ){}^2 \\ y(x)\to 0 \\ \end{align*}