Final answer:
Macbeth dismisses the topic of the witches by stating he does not think of them and quickly changes the subject to the feast that night.
Step-by-step explanation:
When Banquo mentions to Macbeth that he dreamed of the three weird sisters, Macbeth's response is one that dismisses the topic abruptly. Macbeth says, 'I think not of them' and quickly turns the conversation to other matters by inquiring if Banquo will attend the feast that night. This behavior could be interpreted as an attempt by Macbeth to hide his own deep preoccupation with the prophecies of the witches. Macbeth's reaction to Banquo's dream reflects his inner turmoil and growing obsession with power, setting the stage for his further actions throughout William Shakespeare's tragedy.