Answer: Hello!
A second order differential equation has the next shape:
[tex]y''(t) + p(t)y'(t) + q(t)y(t) = g(t)[/tex]
where p(t), q(t) and g(t) are functions of t, that can be constant numbers for example.
And is called homogeneus when g(t) = 0, so you have:
[tex]y''(t) + p(t)y'(t) + q(t)y(t) = 0[/tex]
Then a second order differential equation is homogeneus ef every term involve either y or the derivatives of y.