x²-x-7 = 0 <= salah satu akar nya adalah α jadi ganti x dengan α
α²-α-7 = 0
α²-α = 7
α² = α+7 <= kali α semua
α³ = α²+7α <= α² = α+7
α³ = α+7+7α
α³ = 8α+7
α³-8α = 7 (D)
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x²-x-7 = 0 <= salah satu akar nya adalah α jadi ganti x dengan α
α²-α-7 = 0
α²-α = 7
α² = α+7 <= kali α semua
α³ = α²+7α <= α² = α+7
α³ = α+7+7α
α³ = 8α+7
α³-8α = 7 (D)