Which of the following is the empty/non-...

Which of the following is the empty/non-empty set
`(i) {x:x"is a real number and"x^(2)-1=0}`
`{x : x"is a real number and" x^(2)+1=0}`
`(iii) {x : x "is a real number and" x^(2)-9=0}`
`(iv) {x : x"is a real number and " x^(2)=x+2}`

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Which of the following is the empty/non-empty set `(i) {x:x"is a real number and"x^(2)-1=0}` `{x : x"is a real number and" x^(2)+1=0}` `(iii) {x : x "is a real number and" x^(2)-9=0}` `(iv) {x : x"is a real number and " x^(2)=x+2}`

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Which of the following is the empty/non-empty set
`(i) {x:x"is a real number and"x^(2)-1=0}`
`{x : x"is a real number and" x^(2)+1=0}`
`(iii) {x : x "is a real number and" x^(2)-9=0}`
`(iv) {x : x"is a real number and " x^(2)=x+2}`