rozwiąż nierowność -4x^{2}-1<0[/tex]
-4x^2-1<0
-4x^2-1=0/:(-4)
x^2-0,25=0
x^2-0,5^2=0
(x+0,5)(x-0,5)=0
x+0,5=0 \/ x-0,5=0
x=-0,5 \/ x=0,5
Odp:x ∈R
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-4x^2-1<0
-4x^2-1=0/:(-4)
x^2-0,25=0
x^2-0,5^2=0
(x+0,5)(x-0,5)=0
x+0,5=0 \/ x-0,5=0
x=-0,5 \/ x=0,5
Odp:x ∈R