Question

dau coroana pentru cine o rezola​

Answer 1

$\frac{5x+3}{x^{2}+4x+1}\geq 1$

5x+3≥x²+4x+1

x²+4x+1-5x-3≤0

x²-x-2≤0

x²-x-2x-2≤0

x(x+1)-2(x+1)≤0

(x-2)(x+1)≤0

x-2≤0=>x≤2=>x∈(-oo, 2]

x+1≤0=>x≤-1=>x∈(-oo, -1]