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2014-10-28T19:18:40+02:00
X²-4x-32=0
Δ = 16+4·32 = 16+128 = 144
x₁ = (4+√Δ)/2 = (4+12)/2 = 16/2 = 8
x₂ = (4-√Δ)/2 = (4-12)/2 = -8/2 = -4
x∈{-4;8}