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p + q = 2
pq = 5
#a
3p dan 3q
PK baru :
x² - 3(p + q)x + (3p . 3q) = 0
x² - 3(2)x + (9 . 5) = 0
x² - 6x + 45 = 0
#b
2p + 1 dan 2q + 1
(2p + 1) + (2q + 1) = 2 + 2(p + q) = 6
(2p + 1)(2q + 1) = 4pq + 2(p + q) + 1 = 25
PK baru :
x² - 6x + 25 = 0