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a) -12x²-x+1<0
Δ=1+48=49
x₁=(1-7):(-24)=1/4
x₂=(1+7):(-24)=-1/3
x∈(-∞,-1/3)u(1/4,∞)
b) x³+x²-9x-9=0
x²(x+1)-9(x+1)=0
(x+1)(x²-9)=0
x=-1 vx=-3 vx=3