Final answer:
Macbeth justifies asking the murderers to kill Banquo by portraying Banquo as their enemy and appealing to their sense of revenge.
Step-by-step explanation:
In Macbeth, Macbeth justifies asking the murderers to kill Banquo by convincing them that Banquo is their enemy. He describes Banquo as someone who has wronged them, reminding them of the loss they have suffered due to Banquo's actions. Macbeth also implies that Banquo's death will bring them happiness and revenge.
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