1.426 problem 427

Internal problem ID [8006]

Book: Differential Gleichungen, E. Kamke, 3rd ed. Chelsea Pub. NY, 1948
Section: Chapter 1, linear first order
Problem number: 427.
ODE order: 1.
ODE degree: 2.

CAS Maple gives this as type [[_1st_order, _with_linear_symmetries], _rational, _dAlembert]

\[ \boxed {\left (3 x +5\right ) {y^{\prime }}^{2}-\left (3 y+x \right ) y^{\prime }+y=0} \]

Solution by Maple

Time used: 0.094 (sec). Leaf size: 67

dsolve((3*x+5)*diff(y(x),x)^2-(3*y(x)+x)*diff(y(x),x)+y(x) = 0,y(x), singsol=all)
 

\begin{align*} y \left (x \right ) = \frac {x}{3}+\frac {10}{9}-\frac {2 \sqrt {15 x +25}}{9} \\ y \left (x \right ) = \frac {x}{3}+\frac {10}{9}+\frac {2 \sqrt {15 x +25}}{9} \\ y \left (x \right ) = \frac {\left (-3 c_{1}^{2}+c_{1} \right ) x}{-3 c_{1} +1}-\frac {5 c_{1}^{2}}{-3 c_{1} +1} \\ \end{align*}

Solution by Mathematica

Time used: 0.018 (sec). Leaf size: 80

DSolve[y[x] - (x + 3*y[x])*y'[x] + (5 + 3*x)*y'[x]^2==0,y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to c_1 \left (x+\frac {5 c_1}{-1+3 c_1}\right ) \\ y(x)\to \frac {1}{9} \left (3 x-2 \sqrt {5} \sqrt {3 x+5}+10\right ) \\ y(x)\to \frac {1}{9} \left (3 x+2 \sqrt {5} \sqrt {3 x+5}+10\right ) \\ \end{align*}