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Homework Statement
Find the inverse Laplace transform of F(s)=(8s^2-4s+12)/(s(s^2+4)).
Homework Equations
A/s+(Bs+C)/(s^2+4)
8s^2-4s+12=A(s^2+4)+(Bs+C)(s)=As^2+4A+Bs^2+Cs=s^2(A+B)+Cs+4A
8=A+B
C=-4
A=3
B=5
L^-1 (3/s)+L^-1 ((5s-4)/(s^2+4))
=3+ (Now I'm stucked.)
The Attempt at a Solution
The answer is f(t)=3-2 sin 2t+5 cos 2t.