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α + β = -x/2
αβ = α/2
Karena α, β, dan (αβ)/2 tiga suku pertama suatu barisan geometri, maka:
α = a
β = ar
(αβ)/2 = ar²
(αβ) = α/2
2αβ = α
2β = 1
β = 1/2
αβ = α/2
α/2 = α/2
α = 1
Maka α = a = 1, β = ar = 1/2. Ini berarti r = 1/2, sehingga U₄:
U₄ = ar³
= 1(1/2)³
= 1/8 (C)
Semoga membantu :)