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x₁ + x₂ = 3 [Dari -b/a]
x₁x₂ = -2 [Dari c/a]
Maka,
1/x₁ + 1/x₂
= (x₂+x₁)/x₁x₂
= (x₁+x₂)/x₁x₂
Substitusikan.
= 3/(-2)
= -3/2
= -1 1/2 [A]