SOLUTION: Factor Completely 81c^2-121 I have tried but I am confused because nothing factors into both 81 and 121 can you please help?

Algebra ->  Graphs -> SOLUTION: Factor Completely 81c^2-121 I have tried but I am confused because nothing factors into both 81 and 121 can you please help?      Log On


   

Question 549364: Factor Completely
81c^2-121
I have tried but I am confused because nothing factors into both 81 and 121 can you please help?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Factor Completely
81c^2-121
-------------
Both 81c^2 and 121 are perfect squares.
-------------
81c%5E2-121+=+%289c%29%5E2+-+11%5E2
The difference of the squares of 2 terms is the sum times the difference.
--------
= (9c + 11)*(9c - 11)