SOLUTION: How do I determine the restricted values, if any, of a rational expression?

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Question 258868: How do I determine the restricted values, if any, of a rational expression?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Look for values of x that are not allowed or lead to an undefined function.
Particularly, division by zero, square root and logarithm arguments less than zero.
Examples:
f%28x%29=5%2F%28x-2%29, x=2 is not allowed, because of division by zero.
+graph%28+300%2C+300%2C+-5%2C+5%2C+-10%2C+10%2C+5%2F%28x-2%29%29+
.
.
.
g%28x%29=%28x-2%29%2Fsqrt%283-x%29, x%3E=3 is not allowed.
+graph%28+300%2C+300%2C+-5%2C+5%2C+-10%2C+10%2C+%28x-2%29%2Fsqrt%283-x%29%29+
.
.
.
etc.