4h2-49
Rewrite 4h2 as (2h)2.
(2h)2-49
Rewrite 49 as 72.
(2h)2-72
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=2h and b=7.
(2h+7)(2h-7)
Factor 4h^2-49
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