21.2 problem 1(b)

Internal problem ID [5311]

Book: An introduction to Ordinary Differential Equations. Earl A. Coddington. Dover. NY 1961
Section: Chapter 5. Existence and uniqueness of solutions to first order equations. Page 190
Problem number: 1(b).
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [_separable]

Solve \begin {gather*} \boxed {y y^{\prime }-x=0} \end {gather*}

Solution by Maple

Time used: 0.004 (sec). Leaf size: 23

dsolve(y(x)*diff(y(x),x)=x,y(x), singsol=all)
 

\begin{align*} y \relax (x ) = \sqrt {x^{2}+c_{1}} \\ y \relax (x ) = -\sqrt {x^{2}+c_{1}} \\ \end{align*}

Solution by Mathematica

Time used: 0.067 (sec). Leaf size: 35

DSolve[y[x]*y'[x]==x,y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to -\sqrt {x^2+2 c_1} \\ y(x)\to \sqrt {x^2+2 c_1} \\ \end{align*}