Question

write A={ X/X 2 = 4 and X belongs to Z in roaster form​

Answer 1

to begin with your ques, a set in set builder form must be always represented within { } so u hv forgotten to add 1 more } and that the ques is not understood properly so the corrected version of the ques according to me is : write A={ X/X² = 4 and X belongs to Z} in roaster form

so ans is :

x = √ 4 = ±2

A = {2,-2}...