SOLUTION: simplify by removing of 1 r^2-81 / (r+9)^2

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Question 501760: simplify by removing of 1
r^2-81 / (r+9)^2
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
r^2-81 / (r+9)^2
notice we can factor the numerator:
[(r+9)(r-9)]/(r+9)^2
canceling we get:
(r-9)/(r+9)