1. The problem statement, all variables and given/known data Basically we were given the attached picture and we are supposed to find at what value for the AC frequency from the Vin will the amplitude be halved at V (CE base) 2. Relevant equations 3. The attempt at a solution I think i am supposed to use V=Iz where Z is the impedance. Then the expression for the impedance should be sqrt([8.25e3]^2+[1/i*w*.22e-6]^2). Since the value i am looking for is half the voltage then the expression should be equal to 2 the impedance at the other frequency. So i get sqrt([8.25e3]^2+[1/i*w*.22e-6]^2). =2sqrt([8.25e3]^2+[1/i*t*.22e-6]^2). where t is the frequency that it is half at. The problem is that the impedances for the capacitor is too large and negative when i calculate this that i dont get a real answer. Any suggestions ?