Write the set {x : x is a natural number and x^2-9=0} in roster form.(a) {3}(b) {-3}(c) {3,-3}(d) {9,3}I had been asked this question during an interview.I'd like to ask this question from Sets and their Representations in portion Sets of Mathematics – Class 11

Write the set {x : x is a natural number and x^2-9=0} in roster form.(

1.	Write the set {x : x is a natural number and x^2-9=0} in roster form.(a) {3}(b) {-3}(c) {3,-3}(d) {9,3}I had been asked this question during an interview.I'd like to ask this question from Sets and their Representations in portion Sets of Mathematics – Class 11
Answer» The correct ANSWER is (a) {3} The best explanation: SINCE x is given as natural NUMBER so x can be positive only.x^2-9=0 => (x-3)(x+3)=0=>x=3,-3. Here, -3 is not a natural number so, the SET {x : x is a natural number and x^2-9=0} can be written as {3}.

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Write the set {x : x is a natural number and x^2-9=0} in roster form.(a) {3}(b) {-3}(c) {3,-3}(d) {9,3}I had been asked this question during an interview.I'd like to ask this question from Sets and their Representations in portion Sets of Mathematics – Class 11

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