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maka persamaan selanjutnya memiliki akar - akar 1/a dan 1/b
Jumlah dari akar - akar :
1/a + 1/b = (a + b)/ab
1/a + 1/b = (-2/3) / (-1/3)
1/a + 1/b = 2
Perkalian akar - akar :
1/a . 1/b = 1/ab = 1/(-1/3)
1/a . 1/b = - 3
Ingat :
x² - (penjunlahan akar-akar)x + (perkalian akar - akar) = 0
x² - (2)x + (-3) = 0
x² - 2x - 3 = 0