Internal problem ID [104]
Book: Differential equations and linear algebra, 3rd ed., Edwards and Penney
Section: Section 1.6, Substitution methods and exact equations. Page 74
Problem number: 26.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [[_1st_order, _with_linear_symmetries], _Bernoulli]
\[ \boxed {y^{3}+3 y^{2} y^{\prime }={\mathrm e}^{-x}} \]
✓ Solution by Maple
Time used: 0.016 (sec). Leaf size: 73
dsolve(y(x)^3+3*y(x)^2*diff(y(x),x) = exp(-x),y(x), singsol=all)
\begin{align*} y \left (x \right ) &= {\mathrm e}^{-x} \left (\left (c_{1} +x \right ) {\mathrm e}^{2 x}\right )^{\frac {1}{3}} \\ y \left (x \right ) &= -\frac {\left (\left (c_{1} +x \right ) {\mathrm e}^{2 x}\right )^{\frac {1}{3}} \left (1+i \sqrt {3}\right ) {\mathrm e}^{-x}}{2} \\ y \left (x \right ) &= \frac {\left (\left (c_{1} +x \right ) {\mathrm e}^{2 x}\right )^{\frac {1}{3}} \left (i \sqrt {3}-1\right ) {\mathrm e}^{-x}}{2} \\ \end{align*}
✓ Solution by Mathematica
Time used: 0.307 (sec). Leaf size: 72
DSolve[y[x]^3+3*y[x]^2*y'[x] == Exp[-x],y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to e^{-x/3} \sqrt [3]{x+c_1} \\ y(x)\to -\sqrt [3]{-1} e^{-x/3} \sqrt [3]{x+c_1} \\ y(x)\to (-1)^{2/3} e^{-x/3} \sqrt [3]{x+c_1} \\ \end{align*}