Answer: 
Step-by-step explanation:
For this exercise it is important to remember the following:

Given the following expression:

You can notice that the radicand (the number inside the square root) is negative. Therefore, in order to simplify the expression, you need to follow these steps:
1. Replace
with
and simplify:

2. Descompose 12 into its prime factors:

3. Substitute into the expression:

4. Since
, you can simplify it:

Answer:
Complete solution is given in the images attached below for better demonstration
Answer:
hi
Step-by-step explanation:
Answer:
Are you sure it ia not x2 - x1 in the denominator?
Answer:
-35.5
Step-by-step explanation: