Determining whether the MOSFET is in saturation or triode. Manual’s Help: The best solutions explicitly write: "Assume saturation first. Solve for ID. Then check VDS > VGS – Vt. If false, re-solve for triode."
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Pinpoint exactly where you are stuck (e.g., KVL/KCL equations, small-signal model substitution, or quadratic math). small-signal model substitution