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x² +6x +6x +36 = 0
(x² +6x) +(6x +36) = 0
x(x +6) +6(x +6) = 0
(x +6) (x +6) = 0
Maka,
x₁ = x₂
x +6 = 0
x = -6
Sehingga,
x₁ = -6
x₂ = -6
Jadi, HP = {-6,-6}.