SubArea: Higher degree equations and inequalitiesLevel: BProject ID: 9000019805Accepted: 1Assuming \(x\in \mathbb{R}\), find the solution set of the following equation. \[ x^{4} + 2x^{2} + 1 = 0 \]\(\emptyset \)\(\left \{-1;1\right \}\)\(\left \{-2;2\right \}\)\(\left \{0\right \}\)
