Answer:
Part A: 0
Part B: All real numbers
Explanation:
Part A: 
We have: 

First, let's evaluate the square: 

Now, what to the xth power will equal 1? 
Remember the fact that anything (except for 0) to the zeroth power is 1. 
Therefore, our x is 0: 

Part B: 
We have: 

Like mentioned previously, anything to the zeroth power is 1. Thus: 

Now, 1 is a special base because 1 to any (real) power is still going to be 1. For example: 

Therefore, our values of x is all real numbers. 
And we're done!