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α+β = -b/a
= 6/3
= 2
αβ = c/a
= - 2/3
α/β + β/α = α²+β² / αβ
= (α+b)²-2αβ / αβ
= (2)²- 2 (-2/3) / (-2/3)
= 4+4/3 / (-2/3)
= 12+4 / -2
= 16 / -2
= -8