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X1 = 4 + 2(akar)3 x2 = 4 - 2(akar)3
(x - 4- 2(akar)3) ( x - 4 + 2(akar)3)
x^2 - (4 - 2(akar)3) x - (4 + 2(akar)3) x + (4 - 2(akar)3) (4 + 2(akar)3) =
x^2 - 4x + 2(akar)3 x - 4x - 2(akar)3 x + 16 + 8(akar)3 - 8(akar)3 - (4 . 3) =
x^2 - 8x + 4 = 0
jawaban E