scuze . o ecuatie are solutii reala daca Δ≥0. Δ=b²-4ac =>Δ=(a²+2a+2)²-4(a+1)(a+1) =>Δ=a⁴+4a²+4+4a³+4a²+8a-4a²-8a-4 . reducem termenii asemenea =>Δ=a⁴+4a³+4a² =>Δ=a²(a²+4a+4) =>Δ=a²(a+2)² =>Δ este patrat perfect =>Δ≥0 =>ecuatia admite solutii reale ∀a∈R