1. Choose an appropriate method to represent the set clique which is composed of all the real roots of the equation x & # 178; - 2x-3 = 0. The answer is {3.0-1} why has 0? 2. There are 8 proper subsets of set {1,2,3}. Please list them! The second question is wrong, there should be 8, which 8? Not which 6!

1. Choose an appropriate method to represent the set clique which is composed of all the real roots of the equation x & # 178; - 2x-3 = 0. The answer is {3.0-1} why has 0? 2. There are 8 proper subsets of set {1,2,3}. Please list them! The second question is wrong, there should be 8, which 8? Not which 6!

In the first question, the answer should be {3, - 1}, no 0
I don't think there are eight of them in the second question
{1} , 2}, {3}, {1,2}, {1,3}, {2,3}, empty sets