Teaching NVS PGT 2024 Test Series Mathematics Sets Set Theory and types of Sets

Which of the following 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 - 9 = 0}
4
{x : x is a real number and x2 = x + 2}
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