x²-x=
x²+x=
x² - x = x(x - 1)
x₁ = 0
x₂ = 1
x² + x = x( x + 1)
x₂ = -1
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x² - x = x(x - 1)
x₁ = 0
x₂ = 1
x² + x = x( x + 1)
x₁ = 0
x₂ = -1