Determining Domain of Functions

I discuss finding domain of functions with the use of graphs or graphing calculators. The domain of the last example is no solution. There is a mistake at 8:40. It should be x greater than or equal to 2 or x is less than or equal to -2. 
Identifying Domain & Range from a Graph
https://www.youtube.com/watch?v=1UAKQ_2yfxI&list=PLGbL7EvScmU7ZqJW4HumYdDYv12Wt3yOk&index=14
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