SOLUTION: Simplify by removing the factors of 1 for r^2-81/r^2-18r+81?

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Question 394905: Simplify by removing the factors of 1 for r^2-81/r^2-18r+81?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Simplify by removing the factors of 1 for r^2-81/r^2-18r+81?
...
%28r%5E2-81%29%2F%28r%5E2-18r%2B81%29
...
%28r-9%29%28r%2B9%29%2F%28r-9%29%5E2
(r-9) cancels off
%28r%2B9%29%2F%28r-9%29
...
m.ananth@hotmail.ca