Răspunsuri

2014-05-10T11:21:49+03:00
-x²-3x+5-x²+1<0
-2x²-3x+6<0  |(-1)⇒
2x²+3x-6>0
o ecuatie de gr 2 are valori pozitive de la (-∞,x1)U(x2,∞) dac Δ>0 si a>0
Δ=b²-4ac=9+48=57

x1,2=(-3 +si- √57)/4
solutia x∈(-∞,-3-√57)U(-3+√57,+∞)