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Δ=(-1)²-4*(-12)*1=1+48=49
x₁=1+7/2=8/2=4
x²=1-7/2=-6/2=-3
12x²+x-1>0
Δ=b²-4*a*c
Δ=1+4*1*12=1+48=49
√Δ=√49=7
x1=(-b-√Δ)/2a = -4
x2=(-b+√Δ)/2a= 3
(x+4)*(x-3)>0 jest to parabola z ramionami skierowanymi do góry
x∈(-∞, -4) i (3, +∞)