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memiliki akar x = 2
artinya
2(2)³ + p(2)² + 7(2) + 6 = 0
16 + 4p + 14 + 6 = 0
36 + 4p = 0
4p = -36
p = -9
kembali ke persamaan
2x³ - 9x² + 7x + 6 = 0
jumlah ketiga akar
x₁ + x₂ + x₃ =