Elementary diff Eq question

[m_the0ry]

I took all my math too fast and I went and forgot it all.

Anyways I'm reviewing differential eq's and I need to solve

x''(t) + 9x'(t) + 14x(t) = -28

Where x'(0)= 0, x(0)=10. Now I remember how to do this for the form

ax''(t) + bx'(t) + cx(t) = 0

I know it has something to do with the characteristic polynomial and a general form but its all fuzzy in my head.