89.16.34 problem 34

Internal problem ID [24684]
Book : A short course in Differential Equations. Earl D. Rainville. Second edition. 1958. Macmillan Publisher, NY. CAT 58-5010
Section : Chapter 9. Nonhomogeneous Equations: Undetermined coefficients. Exercises at page 140
Problem number : 34
Date solved : Thursday, October 02, 2025 at 10:47:03 PM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

\begin{align*} y+2 y^{\prime }+y^{\prime \prime }&=x \end{align*}

With initial conditions

\begin{align*} y \left (0\right )&=-2 \\ y^{\prime }\left (0\right )&=2 \\ \end{align*}

✓ Maple. Time used: 0.010 (sec). Leaf size: 13

ode:=diff(diff(y(x),x),x)+2*diff(y(x),x)+y(x) = x; 
ic:=[y(0) = -2, D(y)(0) = 2]; 
dsolve([ode,op(ic)],y(x), singsol=all);
 

\[ y = -2+{\mathrm e}^{-x} x +x \]

✓ Mathematica. Time used: 0.008 (sec). Leaf size: 15

ode=D[y[x],{x,2}]+2*D[y[x],x]+y[x]== x; 
ic={y[0]==-2,Derivative[1][y][0] ==2}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to e^{-x} x+x-2 \end{align*}

✓ Sympy. Time used: 0.105 (sec). Leaf size: 10

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

\[ y{\left (x \right )} = x + x e^{- x} - 2 \]