33.5.6 problem Problem 24.28

Internal problem ID [7835]
Book : Schaums Outline Differential Equations, 4th edition. Bronson and Costa. McGraw Hill 2014
Section : Chapter 24. Solutions of linear DE by Laplace transforms. Supplementary Problems. page 248
Problem number : Problem 24.28
Date solved : Tuesday, September 30, 2025 at 05:06:09 PM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

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

Using Laplace method With initial conditions

\begin{align*} y \left (0\right )&=1 \\ y^{\prime }\left (0\right )&=0 \\ \end{align*}

✓ Maple. Time used: 0.098 (sec). Leaf size: 20

ode:=diff(diff(y(x),x),x)-y(x) = exp(x); 
ic:=[y(0) = 1, D(y)(0) = 0]; 
dsolve([ode,op(ic)],y(x),method='laplace');
 

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

✓ Mathematica. Time used: 0.011 (sec). Leaf size: 27

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

\begin{align*} y(x)&\to \frac {1}{4} e^{-x} \left (e^{2 x} (2 x+1)+3\right ) \end{align*}

✓ Sympy. Time used: 0.068 (sec). Leaf size: 19

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-y(x) - exp(x) + Derivative(y(x), (x, 2)),0) 
ics = {y(0): 1, Subs(Derivative(y(x), x), x, 0): 0} 
dsolve(ode,func=y(x),ics=ics)
 

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