Question
Mathematics Question on The Empty Set
Which of the following is an empty set ?
A
{x : x2 - 9 = 0, x ∈ R}
B
{x : x2 - 1 = 0, x ∈ R}
C
{x : x2 = x + 2, x ∈ R}
D
{x : x2 + 1 = 0, x ∈ R}
Answer
{x : x2 + 1 = 0, x ∈ R}
Explanation
Solution
The correct answer is (D) : {x : x2 + 1 = 0, x ∈ R}.