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p + q = 3 (Dari -b/a)
p x q = -3 (Dari c/a)
Sehingga,
Untuk koefisien x barunya:
-[(3p+2)+(3q+2)] = -[3(p+q)+4]
= -[3(3)+4]
= -13
Untuk konstanta barunya:
(3p+2)(3q+2) = 9pq + 6(p+q) + 4
= 9(-3) + 6(3) + 4
= -27 + 18 + 4
= -5
Sehingga, persamaannya adalah:
x² - 13x - 5 = 0