1. The problem statement, all variables and given/known data 2. Relevant equations Impedances: Inductor = jωL; Capacitor = 1/jωC 3. The attempt at a solution I attempted to excite the circuit with an Io = 1A source, and then from Zc = 1/jX2 justify Vx = (1)(Zc) Thus, substituting our found Vx and then doing a source transformation, we find our V = g(Vx)(jX1), and thus, our RTh = V/Io, which is not correct. The correct answer is #1 in the image.