Consider a low-pass filter having transfer function, H(s)=6/s²+9s+18​. Find its 3-dB cut-off frequency, ω​, which, by definition, satisfies the criterion, ∣H(jω​)∣²=∣H(j0)∣²/2​. [Hint: Find H(j0). Then using the above definition of ω​, find a quadratic equation satisfied by ω​², which can be solved to find ω​² and hence ω. Also, see an example posted on Moodle.]