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α + 2β = 0
_____________ _
- β = - (p + 1)
β = p + 1
αβ = - 18
(- 2β)β = - 18
- 2β² = - 18
β² = 9
β = 3 atau β = - 3
karena p ≥ 0 maka yang diambil adalah β = 3
sehingga:
3 = p + 1
p = 2