SOLUTION: I really don't understand this one: Determine the nature of the solution of the equation x^2-18x+81=0

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Question 457781: I really don't understand this one:
Determine the nature of the solution of the equation
x^2-18x+81=0
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
You can do it 2 ways.
The discriminant = b%5E2+-+4ac+=+18%5E2+-+4%2A81+=+0
--> 2 real solutions, both x = 9
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Or you can factor it
= (x-9)^2
same thing, 2 real solutions x = 9, or x = 9, multiplicity 2.