20a^2
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a = -2-4a/3-2 = 8-4a = 8(3-2) times both sides by (3-2)-4a = 24-16-4a = 8-a = 2 divide both sides by 4a = -2 times both sides by -1
Add them together: 3a+4a-a = 6a
It is an expression of two terms as: 4a+12
a3-4a = a(a2-4) when factored
It is 4a2.