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α+β = -b/a = 3/2
α.β = c/a = 5/2
(2α -2)(2β -2) = 4αβ -4α -4β + 4
= 4αβ -4(α + β) +4
= 4. 5/2 -4(3/2) +4
= 4(5/2 -3/2 + 2/2)
= 4.4/2
= 8