Answer :

AnimeBrainly
The greatest common factor is 4a

hope this helps
KitKat69
20: 1, 2, 4, 5, 10, 20
12: 1, 2 ,3 ,4, 6, 12
8: 1, 2, 4, 8
The greatest number they have in common is 4 :)
a^2: a,a
a^2: a,a
a: a
Greatest in common is a
So the answer: 4a :)

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