Example 1
Evaluate the rational expression 
for x = 1, or explain why it's impossible.
Example 2
Evaluate the rational expression for x = 0, or explain why it's impossible.
Example 3
Evaluate the rational expression for x = 2, or explain why it's impossible.
Example 4
Evaluate the rational expression for x = -2, or explain why it's impossible.
Example 5
Evaluate the rational expression for x = -3, or explain why it's impossible.