A generator of internal impendance, ZG, delivers maximum power to a load impendance, ZL, only if ZL = __.
ZL = Z∗G ZG = RG + jXG ZL = RG - jXG
In the given circuit, the two-port network has the impendance matrix [Z]=[406060120]. The value of ZL for which maximum power is transferred to the load is Ω.