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a=3 b=5 c=-2
⇒(α+3)+(β+3)
α+β+6=0
α+β=-6
⇒(α+3)( β+3)
αβ+3α +3β+9
αβ+3(α+β)+9
αβ+3(-6)+9
αβ-18+9
αβ-9=0
αβ=9