FREQUENCY approximation is called the low-frequency asymptote.It is measured at frequencies close to zero (low frequency). ∴ The low-frequency asymptote slope depends upon the poles or zeros at the ORIGIN.ADD FROM LMSAnalysis:\(G\left( s \right) = \frac{{6\left( {{s^2} + 10S + 100} \right)}}{{{s^2}\left( {50{s^2} + 15s + 1} \right)}}\) As the G(s) function has two poles at the origin:So, the low freq. asymptote slope will be:= 2(-20)= -40 dB/decode