Answer:

Step-by-step explanation:
The equation is already set equal to zero, so that is a good start
We then need to get x by itself. To do so we need to subtract 12 from both sides to get x² = -12
Then we need to take the square root of both sides
which gives us 
Answer:
x= all real numbers
Step-by-step explanation:
The answer will most definitely be C
Answer:
1. Is correct
2. Isn't correct, (It would be number 1)
3. I'm unsure, (But I believe its number 1)
Step-by-step explanation:
2. These are angles across from each other.
3. These are Angles of the same side that don't over lap.