74.1.1 problem 1

Internal problem ID [15710]
Book : INTRODUCTORY DIFFERENTIAL EQUATIONS. Martha L. Abell, James P. Braselton. Fourth edition 2014. ElScAe. 2014
Section : Chapter 1. Introduction to Differential Equations. Exercises 1.1, page 10
Problem number : 1
Date solved : Monday, March 31, 2025 at 01:45:43 PM
CAS classification : [[_2nd_order, _linear, _nonhomogeneous]]

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

✓ Maple. Time used: 0.003 (sec). Leaf size: 29

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

\[ y = {\mathrm e}^{x} c_2 +{\mathrm e}^{-2 x} c_1 -\frac {x^{3}}{2}-\frac {3 x^{2}}{4}-\frac {9 x}{4}-\frac {15}{8} \]

✓ Mathematica. Time used: 0.015 (sec). Leaf size: 39

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

\[ y(x)\to \frac {1}{8} \left (-4 x^3-6 x^2-18 x-15\right )+c_1 e^{-2 x}+c_2 e^x \]

✓ Sympy. Time used: 0.178 (sec). Leaf size: 34

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

\[ y{\left (x \right )} = C_{1} e^{- 2 x} + C_{2} e^{x} - \frac {x^{3}}{2} - \frac {3 x^{2}}{4} - \frac {9 x}{4} - \frac {15}{8} \]