Nmos-bjt darlington pair dc bias. [Homework Help]
Your calculation mostly seems to be correct. The quadratic equation has the term "25000*Id^2" instead of "25*Id^2", but it is a typo since you have calculated reasonable Id values. Vs for Id = 1.23mA is fine. Vs for Id = 1.715mA would be 3.2V, not 5.1V.