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Masha22
a fost răspuns

rezolvati inecuatiile de gr.2
a)25x²+30x+9>0
b)-5x²+11x-6≥0
c)8-x²>0

Răspuns :

RLoredana
a) Δ=30²-4*25*9=900-900=0
x=-b/2a= -30/50=-3/5
b)Δ=11²-4*(-5) *(-6)=121-120=1
x1=(-11-1)/2*(-5)=-12/-10=6/5
x2=-11+1/-10=-10/-10=1
c) -x²>-8
x²<8
x< 2√2
x<-2√2





















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