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x₁ . x₂ . x₃ = -d/a
x₃ = -8/2 = -4
masukkan x = -4 ke persamaan : 2x³ + 3x² + px + 8 = 0
akan didapat :
2(-64) + 3(16) - 4p + 8 = 0
-128 + 48 + 8 = 4p
p = - 18