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α + β = (2p + 1) + (2q + 1)
= 2p + 2q + 2
= 2(p + q) + 2
= 2. + 2
= 2 ( + 2
= 2(- 5) + 2
= - 10 + 2
= - 8
α .β = ((2p + 1)(2q + 1)
= 4.pq + 2(p + q) + 1
= 4. + 2. + 1
= 4. + 2. + 1
= 4.(-1) + 2 (- 5) + 1
= - 4 - 10 + 1
= - 13
persamaan baru
x² - (α + β) x + α.β = 0
x² - (- 8) x - 13 = 0
x² + 8x - 13 = 0