=>
5x^2-4x-1<11
5x^2-4x-12<0
D=16-4*5*(-12)=256=16^2
X1 = (4+16)/2*5 = 2
X2 = (4-16)/2*5 =-6/5
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=>
5x^2-4x-1<11
5x^2-4x-12<0
D=16-4*5*(-12)=256=16^2
X1 = (4+16)/2*5 = 2
X2 = (4-16)/2*5 =-6/5