When working on the final exam, which is comprehensive and pretty long $(26$ questions!$),$ you feel confident about everything except for one question, and you decide to use an online solver for it$.$

This is not even cheating, because it's only one question, and other than that you have completed the entire final exam yourself.

Your instructor has the option of just giving you $0$ points for this question alone, and he$/$she will do that.

Your instructor has to change your grade for the entire final exam to $0$ and report it to the Dean's Office as an instance of breach of Academic Integrity.

This is a minor instance of cheating, and the instructor will probably only warn your verbally.