Question

Which of the following is an empty set?
a) {x / x is a real number and x^2-1=0}
c) {x / x is a real number and x^2-9= 0}
b) {x / x is a real number and x^2 + 3= 0}
d) {x / x is a real number and x^2 = x+2}​

Answer 1

Answer:

Option a)

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Answer 2

Answer:

a is the right answer .......