SOLUTION: What values of x make this expression undefined? How to check this answer? (x+4)/(x^2-4x+4)

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Question 574691: What values of x make this expression undefined? How to check this answer?
(x+4)/(x^2-4x+4)
Answer by g1000000(5) About Me  (Show Source):
You can put this solution on YOUR website!
You need to find a number that would make the denominator is 0, so you need to solve (x^2-4x+4) to be 0, then just plug in your answer and check to make sure that it is equal to 0.
x%5E2-4x%2B4=0
%28x-2%29%5E2=0
x-2=0
x=2