Factor 25y^2-1/9

Math
25y2-19
Rewrite 25y2 as (5y)2.
(5y)2-19
Rewrite 19 as (13)2.
(5y)2-(13)2
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=5y and b=13.
(5y+13)(5y-13)
Factor 25y^2-1/9

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