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α + β = 3/4 (Dari -b/a)
αβ = -2/4 = -1/2 (Dari c/a)
Maka, nilai tersebut adlalah:
(α+β)² + 2αβ
= (3/4)² + 2(-1/2)
= 9/16 - 1
= (9-16)/16
= -7/16