89.5.31 problem 31

Internal problem ID [24381]
Book : A short course in Differential Equations. Earl D. Rainville. Second edition. 1958. Macmillan Publisher, NY. CAT 58-5010
Section : Chapter 2. Equations of the first order and first degree. Exercises at page 43
Problem number : 31
Date solved : Thursday, October 02, 2025 at 10:22:44 PM
CAS classification : [[_linear, `class A`]]

\begin{align*} y^{\prime }&=4 x -2 y \end{align*}

With initial conditions

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

✓ Maple. Time used: 0.005 (sec). Leaf size: 9

ode:=diff(y(x),x) = 4*x-2*y(x); 
ic:=[y(0) = -1]; 
dsolve([ode,op(ic)],y(x), singsol=all);
 

\[ y = 2 x -1 \]

✓ Mathematica. Time used: 0.028 (sec). Leaf size: 10

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

\begin{align*} y(x)&\to 2 x-1 \end{align*}

✓ Sympy. Time used: 0.086 (sec). Leaf size: 7

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-4*x + 2*y(x) + Derivative(y(x), x),0) 
ics = {y(0): -1} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = 2 x - 1 \]