11.28 problem 319

Internal problem ID [3575]

Book: Ordinary differential equations and their solutions. By George Moseley Murphy. 1960
Section: Various 11
Problem number: 319.
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [_separable]

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

Solution by Maple

Time used: 0.0 (sec). Leaf size: 32

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

\[ y \left (x \right ) = \frac {b}{\left (x +a \right )^{\frac {b}{a}} x^{-\frac {b}{a}} c_{1} b -c} \]

Solution by Mathematica

Time used: 0.973 (sec). Leaf size: 65

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

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