SubArea: Quadratic equations and inequalitiesLevel: AProject ID: 9000025606Accepted: 1Clonable: 0Easy: 1In the following list identify a quadratic equation which has a unique solution.\(x^{2} + 2x + 1 = 0\)\(x^{2} - 3x - 1 = 0\)\(x^{2} + 2x - 1 = 0\)\(x^{2} - 3x + 1 = 0\)
