7.8.28 problem 41

Internal problem ID [242]
Book : Elementary Differential Equations. By C. Henry Edwards, David E. Penney and David Calvis. 6th edition. 2008
Section : Chapter 2. Linear Equations of Higher Order. Section 2.1 (Introduction. Second order linear equations). Problems at page 111
Problem number : 41
Date solved : Tuesday, March 04, 2025 at 11:06:09 AM
CAS classification : [[_2nd_order, _missing_x]]

\begin{align*} 6 y^{\prime \prime }-7 y^{\prime }-20 y&=0 \end{align*}

✓ Maple. Time used: 0.003 (sec). Leaf size: 17

ode:=6*diff(diff(y(x),x),x)-7*diff(y(x),x)-20*y(x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = \left (c_2 \,{\mathrm e}^{\frac {23 x}{6}}+c_1 \right ) {\mathrm e}^{-\frac {4 x}{3}} \]

✓ Mathematica. Time used: 0.015 (sec). Leaf size: 26

ode=6*D[y[x],{x,2}]-7*D[y[x],x]-20*y[x]==0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to c_1 e^{-4 x/3}+c_2 e^{5 x/2} \]

✓ Sympy. Time used: 0.163 (sec). Leaf size: 19

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(-20*y(x) - 7*Derivative(y(x), x) + 6*Derivative(y(x), (x, 2)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = C_{1} e^{- \frac {4 x}{3}} + C_{2} e^{\frac {5 x}{2}} \]