2x-3x²≤-1
-3x²+2x+1≤0
Δ=2²-4·(-3)·1
Δ=4+12
Δ=16
√Δ=√16=4
x₁=(-2-4)/(2·(-3))=-6/-6=1
x₂=(-2+4)/(2·(-3))=2/-6=-1/3
x∈(-∞,-1/3>∪<1,+∞)
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2x-3x²≤-1
-3x²+2x+1≤0
Δ=2²-4·(-3)·1
Δ=4+12
Δ=16
√Δ=√16=4
x₁=(-2-4)/(2·(-3))=-6/-6=1
x₂=(-2+4)/(2·(-3))=2/-6=-1/3
x∈(-∞,-1/3>∪<1,+∞)