1)
What is the meaning of "Piryamo me'Eretz Te'abed"?
1.
Rashi: David prays that Hashem destroy the seed of Amalek.
2.
Malbim: Their deeds and acquisitions should perish from the land.
2)
What does "v'Zar'am mi'Bnei Adam" add?
1.
Radak: There should be no remembrance of them.
2.
Malbim: Their seed should cease. (The first part of the verse discusses only their property.)