5m Zen
4a b c 2
4a b c 2 pictures 5
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4a b
4a b c 2
4a^2-1/9(b)^2
k c b 2 4a
4a 2 b 3 c whole square
4a 9 b 2 c
a 2 b 4a c 3a
factor completely b^2-c^2+4a^2-4ab
expand 4a b 2 c square
min c b 2 4a
b 2 c 2 4a 2 4ab
4a b c 2
