Internal problem ID [12933]
Book: DIFFERENTIAL EQUATIONS by Paul Blanchard, Robert L. Devaney, Glen R. Hall. 4th
edition. Brooks/Cole. Boston, USA. 2012
Section: Chapter 1. First-Order Differential Equations. Exercises section 1.4 page 61
Problem number: 5.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [_quadrature]
\[ \boxed {w^{\prime }-\left (3-w\right ) \left (w+1\right )=0} \] With initial conditions \begin {align*} [w \left (0\right ) = 4] \end {align*}
✓ Solution by Maple
Time used: 0.11 (sec). Leaf size: 23
dsolve([diff(w(t),t)=(3-w(t))*(w(t)+1),w(0) = 4],w(t), singsol=all)
\[ w \left (t \right ) = \frac {15 \,{\mathrm e}^{4 t}+1}{-1+5 \,{\mathrm e}^{4 t}} \]
✓ Solution by Mathematica
Time used: 0.02 (sec). Leaf size: 26
DSolve[{w'[t]==(3-w[t])*(w[t]+1),{w[0]==4}},w[t],t,IncludeSingularSolutions -> True]
\[ w(t)\to \frac {15 e^{4 t}+1}{5 e^{4 t}-1} \]