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x₁ = -4
x₂ = -5
Dijawab :
(x -x₁) (x -x₂)
= (x -(-4)) (x -(-5))
= (x +4) (x +5)
= x² +5x +4x +20
= x² +9x +20
Jadi, persamaan kuadratnya adalah x² +9x +20.