Factor 25r^2-81

Math
25r2-81
Rewrite 25r2 as (5r)2.
(5r)2-81
Rewrite 81 as 92.
(5r)2-92
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=5r and b=9.
(5r+9)(5r-9)
Factor 25r^2-81

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