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3x²-6x+x-2>0
3x²-5x-2>0
Δ=25+24=49 √Δ=7
x₁=5-7/6=-⅓
x₂=5+7/6=2
x∈(-∞,-⅓) (suma) (2,∞)
4x²-1≤0
Δ=16 √Δ=4
x₁=-4/8=-½
x₂=4/8=½
x∈<-½,½>