7.11.4 problem 4

Internal problem ID [325]
Book : Elementary Differential Equations. By C. Henry Edwards, David E. Penney and David Calvis. 6th edition. 2008
Section : Chapter 2. Linear Equations of Higher Order. Section 2.5 (Nonhomogeneous equations and undetermined coefficients). Problems at page 161
Problem number : 4
Date solved : Tuesday, March 04, 2025 at 11:08:32 AM
CAS classification : [[_2nd_order, _linear, _nonhomogeneous]]

\begin{align*} 4 y^{\prime \prime }+4 y^{\prime }+y&=3 x \,{\mathrm e}^{x} \end{align*}

✓ Maple. Time used: 0.006 (sec). Leaf size: 24

ode:=4*diff(diff(y(x),x),x)+4*diff(y(x),x)+y(x) = 3*x*exp(x); 
dsolve(ode,y(x), singsol=all);
 

\[ y = \left (c_1 x +c_2 \right ) {\mathrm e}^{-\frac {x}{2}}+\frac {\left (3 x -4\right ) {\mathrm e}^{x}}{9} \]

✓ Mathematica. Time used: 0.018 (sec). Leaf size: 33

ode=4*D[y[x],{x,2}]+4*D[y[x],x]+y[x]==3*x*Exp[x]; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to \frac {1}{9} e^x (3 x-4)+e^{-x/2} (c_2 x+c_1) \]

✓ Sympy. Time used: 0.223 (sec). Leaf size: 22

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-3*x*exp(x) + y(x) + 4*Derivative(y(x), x) + 4*Derivative(y(x), (x, 2)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = \left (C_{1} + C_{2} x\right ) e^{- \frac {x}{2}} + \frac {\left (3 x - 4\right ) e^{x}}{9} \]