x²+4x-1<0;
D=16+4=10;
x1=(-4+√20)/2=-2+√5;
x2=-2-√5/2;
+ - +
_____-2-√5_________-2+√5_______
-2-√5<x<-2+√5;
x^2+4x+1>0;
D=16-4=12;
x1=(-4+√12)/2=-2+√3;
x2=-2-√3;
_____-2-√3_________-2+√3_______
x<-2-√3;
x>-2+√3;
x ∈ ∪ ;
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Answers & Comments
x²+4x-1<0;
D=16+4=10;
x1=(-4+√20)/2=-2+√5;
x2=-2-√5/2;
+ - +
_____-2-√5_________-2+√5_______
-2-√5<x<-2+√5;
x^2+4x+1>0;
D=16-4=12;
x1=(-4+√12)/2=-2+√3;
x2=-2-√3;
+ - +
_____-2-√3_________-2+√3_______
x<-2-√3;
x>-2+√3;
x ∈ ∪ ;