36.2.17 problem 17

Internal problem ID [6310]
Book : Fundamentals of Differential Equations. By Nagle, Saff and Snider. 9th edition. Boston. Pearson 2018.
Section : Chapter 2, First order differential equations. Section 2.3, Linear equations. Exercises. page 54
Problem number : 17
Date solved : Sunday, March 30, 2025 at 10:50:25 AM
CAS classification : [_linear]

\begin{align*} y^{\prime }-\frac {y}{x}&=x \,{\mathrm e}^{x} \end{align*}

With initial conditions

\begin{align*} y \left (1\right )&={\mathrm e}-1 \end{align*}

✓ Maple. Time used: 0.021 (sec). Leaf size: 10

ode:=diff(y(x),x)-y(x)/x = x*exp(x); 
ic:=y(1) = -1+exp(1); 
dsolve([ode,ic],y(x), singsol=all);
 

\[ y = \left ({\mathrm e}^{x}-1\right ) x \]

✓ Mathematica. Time used: 0.05 (sec). Leaf size: 12

ode=D[y[x],x]-y[x]/x==x*Exp[x]; 
ic={y[1]==Exp[1]-1}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to \left (e^x-1\right ) x \]

✓ Sympy. Time used: 0.215 (sec). Leaf size: 8

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-x*exp(x) + Derivative(y(x), x) - y(x)/x,0) 
ics = {y(1): -1 + E} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = x \left (e^{x} - 1\right ) \]