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(x + 4)(x - 3) = 0
x₁ = -4
x₂ = 3
2 . x² + 9x + 18 = 0
(x + 6)(x + 3) = 0
x₁ = -6
x₂ = -3
3. 2x² - 10x +12 = 0
(2x - 4 )(x - 3) = 0
x₁ = 2
x₂ = 3