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α+β = -b/a = -(-6)/1 = 6/1 = 6
αβ = c/a = -k/1 = -k
α²+β² = 8
(α+β)²-2αβ = 8
6² - 2(-k) = 8
36 + 2k = 8
2k = 8-36
k = -28/2
k = -14
Jadi nilai k adalah -14