Find the inverse transforms of the following functions and then validate your answers using MATLAB:

(a) \(F_{1}(s)=\frac{\left(s+10^{5}\right)\left(s+10^{6}\right)}{s\left(s+10^{7}\right)\left(s+10^{8}\right)}\)

(b) \(F_{2}(s)=\frac{40\left(s^{4}+4 s^{2}+4\right)}{s\left(s^{2}+1\right)\left(s^{2}+4\right)}\)