1.71 problem 74

Internal problem ID [3216]

Book: Differential equations for engineers by Wei-Chau XIE, Cambridge Press 2010
Section: Chapter 2. First-Order and Simple Higher-Order Differential Equations. Page 78
Problem number: 74.
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [_rational, _Bernoulli]

\[ \boxed {y \left (6 y^{2}-x -1\right )+2 x y^{\prime }=0} \]

Solution by Maple

Time used: 0.0 (sec). Leaf size: 54

dsolve(y(x)*(6*y(x)^2-x-1)+2*x*diff(y(x),x)=0,y(x), singsol=all)
 

\begin{align*} y \left (x \right ) = \frac {\sqrt {\left (c_{1} {\mathrm e}^{-x}+6\right ) x}}{c_{1} {\mathrm e}^{-x}+6} y \left (x \right ) = -\frac {\sqrt {\left (c_{1} {\mathrm e}^{-x}+6\right ) x}}{c_{1} {\mathrm e}^{-x}+6} \end{align*}

Solution by Mathematica

Time used: 0.709 (sec). Leaf size: 65

DSolve[y[x]*(6*y[x]^2-x-1)+2*x*y'[x]==0,y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to -\frac {e^{x/2} \sqrt {x}}{\sqrt {6 e^x+c_1}} y(x)\to \frac {e^{x/2} \sqrt {x}}{\sqrt {6 e^x+c_1}} y(x)\to 0 \end{align*}