Hi chukie! First, let me make your notation easier to read:

You are correct that is defined at .

For the others:

1. When taking a limit, we only care about what happens to a function as itapproachesa certain value, not what happens at that value. So, the limit of as will be the same as the limit of the first "piece."

2. For a function to be continuous at a point , three things must be true:

*

*

*

You should know the first 2 by answering the other two parts of this problem. So, take the limit of as . Then, if the value of this limit is , then is continuous at , and it will be discontinuous otherwise.

You should be able to find which value for makes the function continuous.