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(x + 1)(x + 1)
x + 1 = 0
x = -1
x + 1 = 0
x = -1
p = -1 dan q = -1
2p = 2(-1) = -2
2q = 2(-1) = -2
x1 = -2
x1 + 2 = 0
x2 = -2
x2 + 2 = 0
(x + 2)(x + 2)
= x² + 4x + 4
x² + 4x + 4 = 0