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⇒ (x + 8)(x - 1) = 0
maka
x + 8 = 0 ⇒ x₁ = -8
x - 1 = 0 ⇒ x₂ = 1
maka persamaan kuadrat dengan akar-akar berkebalikan ialah
(y - 1/x₁)(y - 1/x₂) = 0
⇒ (y + 1/8)(y - 1/1) = 0
⇒ 8(y + 1/8)(y - 1) = 8(0)
⇒ (8y + 1)(y - 1) = 0
⇒ 8y² - 7y - 1 = 0
Jawab : D
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