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zał.9x²+9x+2≥0
Δ=81-72=9
x₁=(-9-3):18=-12/18=-2/3
x₂=(-9+3):18=-6/18=-1/3
rysujemy os zaznaczamy x₁ i x₂ ,kreślimy parabolę ramionami do góry i mamy x∈(-∞;-2/3>u<-1/3,∞)