20.15 problem 560

Internal problem ID [3812]

Book: Ordinary differential equations and their solutions. By George Moseley Murphy. 1960
Section: Various 20
Problem number: 560.
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [_separable]

\[ \boxed {x \left (a +y b \right ) y^{\prime }-c y=0} \]

Solution by Maple

Time used: 0.015 (sec). Leaf size: 42

dsolve(x*(a+b*y(x))*diff(y(x),x) = c*y(x),y(x), singsol=all)
 

\[ y \left (x \right ) = {\mathrm e}^{-\frac {a \operatorname {LambertW}\left (\frac {b \,x^{\frac {c}{a}} {\mathrm e}^{\frac {c c_{1}}{a}}}{a}\right )-c \ln \left (x \right )-c c_{1}}{a}} \]

Solution by Mathematica

Time used: 0.954 (sec). Leaf size: 36

DSolve[x(a+b y[x])y'[x]==c y[x],y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to \frac {a W\left (\frac {b e^{\frac {c_1}{a}} x^{\frac {c}{a}}}{a}\right )}{b} y(x)\to 0 \end{align*}