Question

Sashi agreed that A = {x: x2 - 9 = 0;x e R an empty set ? Do you agree her ? Justify
your answer ?​

Answer 1

Yes, X is the empty set.

The set you give is the set of numbers that are both (3 or -3) AND 2. Obviously, no number can be both of these, so X is the empty set.

When you 'AND' two propositions, the result is true if and only if both propositions are true.