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?

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) (Show Source): You can put this solution on YOUR website!
Factor Completely
81c^2-121
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Both 81c^2 and 121 are perfect squares.
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The difference of the squares of 2 terms is the sum times the difference.
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= (9c + 11)*(9c - 11)

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