25n2-49
Rewrite 25n2 as (5n)2.
(5n)2-49
Rewrite 49 as 72.
(5n)2-72
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=5n and b=7.
(5n+7)(5n-7)
Factor 25n^2-49
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