Quality factor of an RLC Circuit
The voltage source can be assumed to be ideal and therefore have zero internal impedance. So you now have a voltage source in series with 100 KΩ. This can now be replaced with a current source in parallel with 100 KΩ. This is just a Thevenin-Norton transform which many textbooks describe. Now that everything is in parallel, the Q is easy for you to complete for your homework.