Answer:
I believe it is because it does not start at 0
HI THIS IS VERY HARD CAN U GIVE ME MORE TIME
100 is the correct answer to your question
The corresponding homogeneous ODE has characteristic equation
with roots at
, thus admitting the characteristic solution

For the particular solution, assume one of the form



Substituting into the ODE gives



Then the general solution to this ODE is



Assume a solution of the form



Substituting into the ODE gives



so the solution is



Assume a solution of the form


Substituting into the ODE gives



so the solution is
