88.25.9 problem 7

Internal problem ID [24214]
Book : Elementary Differential Equations. By Lee Roy Wilcox and Herbert J. Curtis. 1961 first edition. International texbook company. Scranton, Penn. USA. CAT number 61-15976
Section : Chapter 7. Series Methods. Exercises at page 212
Problem number : 7
Date solved : Thursday, October 02, 2025 at 10:00:52 PM
CAS classification : [[_Emden, _Fowler]]

\begin{align*} x^{2} y^{\prime \prime }+5 x y^{\prime }-5 y&=0 \end{align*}

Using series method with expansion around

\begin{align*} 0 \end{align*}

✓ Maple. Time used: 0.008 (sec). Leaf size: 25

Order:=6; 
ode:=x^2*diff(diff(y(x),x),x)+5*x*diff(y(x),x)-5*y(x) = 0; 
dsolve(ode,y(x),type='series',x=0);
 

\[ y = c_1 x \left (1+\operatorname {O}\left (x^{6}\right )\right )+\frac {c_2 \left (-86400+\operatorname {O}\left (x^{6}\right )\right )}{x^{5}} \]

✓ Mathematica. Time used: 0.003 (sec). Leaf size: 14

ode=x^2*D[y[x],{x,2}]+5*x*D[y[x],{x,1}]-5*y[x]==0; 
ic={}; 
AsymptoticDSolveValue[{ode,ic},y[x],{x,0,5}]
 

\[ y(x)\to \frac {c_1}{x^5}+c_2 x \]

✓ Sympy. Time used: 0.204 (sec). Leaf size: 14

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(x**2*Derivative(y(x), (x, 2)) + 5*x*Derivative(y(x), x) - 5*y(x),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics,hint="2nd_power_series_regular",x0=0,n=6)
 

\[ y{\left (x \right )} = C_{2} x + \frac {C_{1}}{x^{5}} + O\left (x^{6}\right ) \]