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x^2 - (jumlah akar)x + (perkalian akar)
Jumlah akar = 1/3 + 2/3
= 3/3 = 1
perkalian akar = 1/3 x 2/3
= 2/9
PK baru = x^2 - 1x + 2/9
= 9x^2 - 9x + 2