73.17.21 problem 21

Internal problem ID [15484]
Book : Ordinary Differential Equations. An introduction to the fundamentals. Kenneth B. Howell. second edition. CRC Press. FL, USA. 2020
Section : Chapter 25. Review exercises for part III. page 447
Problem number : 21
Date solved : Monday, March 31, 2025 at 01:39:11 PM
CAS classification : [[_2nd_order, _missing_x]]

\begin{align*} 16 y^{\prime \prime }-8 y^{\prime }+y&=0 \end{align*}

✓ Maple. Time used: 0.002 (sec). Leaf size: 14

ode:=16*diff(diff(y(x),x),x)-8*diff(y(x),x)+y(x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = {\mathrm e}^{\frac {x}{4}} \left (c_2 x +c_1 \right ) \]

✓ Mathematica. Time used: 0.015 (sec). Leaf size: 20

ode=16*D[y[x],{x,2}]-8*D[y[x],x]+y[x]==0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to e^{x/4} (c_2 x+c_1) \]

✓ Sympy. Time used: 0.172 (sec). Leaf size: 12

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(y(x) - 8*Derivative(y(x), x) + 16*Derivative(y(x), (x, 2)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

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