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x² +5x -36 = 0
x² +9x -4x -36 = 0
(x² +9x) -(4x +36) = 0
x(x +9) -4(x +9) = 0
(x -4) (x +9) = 0
x -4 = 0
x₁ = 4
x +9 = 0
x₂ = -9
Jadi, akar-akarnya adalah {4,-9}.