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x(x + 1) = 2
x² + x = 2
x² + x -2 = 0
(x + 2)(x -1) = 0
x₁ = -2
x₂ = 1
2. x₂ - x - 6 = 0
(x+2)(x-3) = 0
x₁ = -2
x₂ = 3
3. 2x² + 5x + 3 = 0
(2x + 3)(x + 1) = 0
x₁ = -3/2
x₂ = -1