Factor 4a^2-9

Math
4a2-9
Rewrite 4a2 as (2a)2.
(2a)2-9
Rewrite 9 as 32.
(2a)2-32
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=2a and b=3.
(2a+3)(2a-3)
Factor 4a^2-9

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