4a square - 12a +9-49bsquare
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4a^2 - 12a + 9 - 49b^2
(4a^2 - 12a + 9) - 49b^2
(2a - 3)^2 - (7b)^2
(2a - 3 + 7b ) (2a - 3 - 7b)
(2a + 7b - 3) (2a - 7b - 3)
(4a^2 - 12a + 9) - 49b^2
(2a - 3)^2 - (7b)^2
(2a - 3 + 7b ) (2a - 3 - 7b)
(2a + 7b - 3) (2a - 7b - 3)
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