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x²(2x+1)-4(2x+1)
(x²-4)(2x+1)
(x-2)(x+2)(2x+1)
xdo5-2xdo4-2xdo3
x³(x²-2x-2)
Δ=4-4*(-2)
Δ=12
√Δ=2√3
x₁=2-2√3/2
x₁=1-√3
x₂=1+√3