Stuart's best golf score is 4 under par, or -4. He wants to beat this score by an additional 3 strokes under par. With one hole remaining, Stuart is 5 under par, or -5. What must his score be on the last hole to beat his best score? Explain your answer. Stuart needs a score of ___ strokes under par, or __ on the last hole in order to score ___ strokes under par, or ___, overall.