Final answer:
Joan was first examined for heresy in 1431 and was found guilty, leading to her execution.
Step-by-step explanation:
Joan was first examined for heresy in 1431 during the trial conducted by the Inquisition. The result of the trial was that Joan was found guilty of heresy, specifically for claiming to have had divine revelation and for wearing male clothing. As a result, she was sentenced to death and burned at the stake.