Hi everybody,

For example a diff. eqn

(D^3+D^2+D+1)h(t)=impulse(t)

I learn that particular solution for impulse(t) is

h(t)=Xh(t).u(t) where Xh(t) is homogenous soln. and u(t) is step fn.

But I did not understand this derivation, how this expression is particular soln. for impulse?

How can we determine coeff. appears in homogenous soln. and then our particular soln. become well known?

Thanks a lot.