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-4x²+12x-9<0
Δ=b²-4ac=144-144=0 x0=-b/2a=-12/-8=3/2
x∈(-∞,3/2)∨(3/2,+∞)
-3x²+2x-1/3≤0 /*3
-9x²+6x-1≤0
Δ=36-36=0 x0=-6/-18=1/3
x∈ R
6x²-x-12>0
Δ=1+288=289 √Δ=17
x1=[-b-√Δ]/2a=[1-17]/12=-16/12=-4/3
x2=[-b+√Δ]/2a=[1+17]/12=18/12=3/2
x∈(-∞,-4/3)∨(3/2,+∞)
-9x²+2x-1/9<0 /*9
-81x²+18x-1<0
Δ=324-324=0 x0=-18/-162=1/9
x∈(-∞,1/9)∨(1/9,+∞)