Factor -25+4y^2

Factor -1 out of -25+4y2.
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Reorder -25 and 4y2.
Factor -1 out of 4y2.
Rewrite -25 as -1(25).
Factor -1 out of -(-4y2)-1(25).
Rewrite 25 as 52.
Rewrite 4y2 as (2y)2.
Reorder -(2y)2 and 52.
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=5 and b=2y.
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Multiply 2 by -1.
Remove unnecessary parentheses.
Factor -25+4y^2

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