sharonnnnnnnb5383 sharonnnnnnnb5383 29-02-2024 Mathematics contestada Which of the following set is the empty set? 1) x | x is a real number and x² - 1 = 0 2) x | x is a real number and x² + 1 = 0 3) x | x is a real number and x² + 1 = 1 4) x | x is a real number and x² - 1 = 1
