74.10.2 problem 2

Internal problem ID [16128]
Book : INTRODUCTORY DIFFERENTIAL EQUATIONS. Martha L. Abell, James P. Braselton. Fourth edition 2014. ElScAe. 2014
Section : Chapter 4. Higher Order Equations. Exercises 4.2, page 147
Problem number : 2
Date solved : Thursday, March 13, 2025 at 07:52:28 AM
CAS classification : [[_2nd_order, _missing_x]]

\begin{align*} y^{\prime \prime }-4 y^{\prime }-12 y&=0 \end{align*}

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

ode:=diff(diff(y(t),t),t)-4*diff(y(t),t)-12*y(t) = 0; 
dsolve(ode,y(t), singsol=all);
 

\[ y = c_{1} {\mathrm e}^{-2 t}+c_{2} {\mathrm e}^{6 t} \]

✓ Mathematica. Time used: 0.014 (sec). Leaf size: 22

ode=D[y[t],{t,2}]-4*D[y[t],t]-12*y[t]==0; 
ic={}; 
DSolve[{ode,ic},y[t],t,IncludeSingularSolutions->True]
 

\[ y(t)\to e^{-2 t} \left (c_2 e^{8 t}+c_1\right ) \]

✓ Sympy. Time used: 0.146 (sec). Leaf size: 15

from sympy import * 
t = symbols("t") 
y = Function("y") 
ode = Eq(-12*y(t) - 4*Derivative(y(t), t) + Derivative(y(t), (t, 2)),0) 
ics = {} 
dsolve(ode,func=y(t),ics=ics)
 

\[ y{\left (t \right )} = C_{1} e^{- 2 t} + C_{2} e^{6 t} \]