78.14.7 problem 3 (e)

Internal problem ID [18272]
Book : DIFFERENTIAL EQUATIONS WITH APPLICATIONS AND HISTORICAL NOTES by George F. Simmons. 3rd edition. 2017. CRC press, Boca Raton FL.
Section : Chapter 3. Second order linear equations. Section 19. The Method of Variation of Parameters. Problems at page 135
Problem number : 3 (e)
Date solved : Monday, March 31, 2025 at 05:24:28 PM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

\begin{align*} 2 y^{\prime \prime }+3 y^{\prime }+y&={\mathrm e}^{-3 x} \end{align*}

✓ Maple. Time used: 0.002 (sec). Leaf size: 24

ode:=2*diff(diff(y(x),x),x)+3*diff(y(x),x)+y(x) = exp(-3*x); 
dsolve(ode,y(x), singsol=all);
 

\[ y = \frac {{\mathrm e}^{-3 x}}{10}-2 \,{\mathrm e}^{-x} c_1 +{\mathrm e}^{-\frac {x}{2}} c_2 \]

✓ Mathematica. Time used: 0.019 (sec). Leaf size: 33

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

\[ y(x)\to \frac {e^{-3 x}}{10}+c_1 e^{-x/2}+c_2 e^{-x} \]

✓ Sympy. Time used: 0.238 (sec). Leaf size: 22

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

\[ y{\left (x \right )} = C_{1} e^{- x} + C_{2} e^{- \frac {x}{2}} + \frac {e^{- 3 x}}{10} \]