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misal akar akarnya itu a dan yang satu lagi 2a
(x - a)(x - 2a) = 0
2(x^2 - 3ax + 2a^2) = 0
2x^2 - 6ax + 4a^2 = 2x^2 + px + 4
4a^2 = 4
a^2 = 1
a = 1 atau a = -1
-6ax = px
kita masukkan a = 1
-6x = px
jadi p = -6
kita masukkan a = -1
6x = px
jadi p = 6