44.5.54 problem 47 (d)

Internal problem ID [7116]
Book : A First Course in Differential Equations with Modeling Applications by Dennis G. Zill. 12 ed. Metric version. 2024. Cengage learning.
Section : Chapter 2. First order differential equations. Section 2.2 Separable equations. Exercises 2.2 at page 53
Problem number : 47 (d)
Date solved : Tuesday, February 04, 2025 at 12:15:27 AM
CAS classification : [_quadrature]

\begin{align*} y^{\prime }&=y-y^{3} \end{align*}

With initial conditions

\begin{align*} y \left (0\right )&=-2 \end{align*}

✓ Solution by Maple

Time used: 0.023 (sec). Leaf size: 16

dsolve([diff(y(x),x)=y(x)-y(x)^3,y(0) = -2],y(x), singsol=all)
 

\[ y = -\frac {2}{\sqrt {4-3 \,{\mathrm e}^{-2 x}}} \]

✓ Solution by Mathematica

Time used: 0.009 (sec). Leaf size: 23

DSolve[{D[y[x],x]==y[x]-y[x]^3,{y[0]==-2}},y[x],x,IncludeSingularSolutions -> True]
 

\[ y(x)\to -\frac {2 e^x}{\sqrt {4 e^{2 x}-3}} \]