Which of the following is the empty set
Which of the following is the empty set
- A
$\{ x:x$ is a real number and ${x^2} - 1 = 0\} $
- B
$\{ x:x$ is a real number and ${x^2} + 1 = 0\} $
- C
$\{ x:x$ is a real number and ${x^2} - 9 = 0\} $
- D
$\{ x:x$ is a real number and ${x^2} = x + 2\} $
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