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x²-8x+16+x²+2x-4x-8≥0
2x²-10x+8≥0/:2
x²-5x+4≥0
Δ=25-4*1*4=9
√Δ=3
x₁=(5-3)/2=1
x₂=(5+3)/2=4
rysujemy parabolę do góry ramionami i odczytujemy x∈(-∞,1>u<4,∞)