Its okay i solved it via a bit of algebraic manipulation.
So i have to determine the inverse transform of
-3s/((s+2)^2+1)
Using linearity and s-shifting and know transform for cos(wt)
I came out with
-3*exp(-2t)*cost
Is this correct?
I am unsure about the 's' in the numerator, not also being 'shifted', should i be using partial fractions?
Playing around with WolframAlpha is a good way to check your answer.