Question

Which of the following is an empty set:

a) {x : xR and x2

– 1 = 0}

b) {x : xR and x2

+ 1 = 0}

c) {x : xR and x2

– 9 = 0}

d) {x : xR and x2

= x + 2}​

Answer 1

Answer:

option c is the null or empty set in this. Because a square of a real number+ one can never be equal to zero

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