Rozwiąż nierówność:c) x+1>-3x²
d) 9x²+4≤12x
x+1>-3x²
3x²+x+1>0
Δ=b²-4ac=1-12=-11
x∈R
9x²+4≤12x
9x²-12x+4≤0
Δ=144-144=0
x₀=-b/2a=12/18=⅔
x=⅔
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x+1>-3x²
3x²+x+1>0
Δ=b²-4ac=1-12=-11
x∈R
9x²+4≤12x
9x²-12x+4≤0
Δ=144-144=0
x₀=-b/2a=12/18=⅔
x=⅔