Given the set M = {y | y = x ^ 2-1, X ∈ r} n = {x | y = √ 3-x & # 178;} then m ∩ n =? The answer I did was - 1

Given the set M = {y | y = x ^ 2-1, X ∈ r} n = {x | y = √ 3-x & # 178;} then m ∩ n =? The answer I did was - 1

You are right, the answer is wrong