0>2x²-x-1;
2x²-x-1<0;
2x²-x-1=0;
D=1+4*2=9;
x=(1+3)/4=1;
x=(1-3)/4=-0,5;
+ - +
___-0,5____1____
x ∈ (-0,5;1);
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0>2x²-x-1;
2x²-x-1<0;
2x²-x-1=0;
D=1+4*2=9;
x=(1+3)/4=1;
x=(1-3)/4=-0,5;
+ - +
___-0,5____1____
x ∈ (-0,5;1);