In the tragedy of macbeth, act iii, why does macbeth order the death of fleance as well as banquo

Macbeth knows they suspect him of foul play, and he is furious that he has done all of the work
(so-to-speak) of becoming king, and Banquo's descendants will benefit from it.

This is what i found “an elliptical clause is a type of dependent, or subordinate, clause that is missing a word or words. often, the missing part is a verb or verb phrase. while elliptical clauses are acceptable to use, they can sometimes cause confusion for writers and readers, especially when the sentence ends with a pronoun.” i hope this you for what your looking for. can you plz mark me brainliest?