Question

answer this question with full method plz

Answer 1

This is an empty set,Null set.
because set belongs to that elements whose square are not positive.
since square of negative and positive numbers are positive. A= Null set

Answer 2

Given
A={x/x: x belongs to I; x² is not positive
since we know that square of any integer is positive
hence A is a null set
i.e.A={ }