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(5x - 3)² - (6x + 5)² =
[ (5x - 3) + (6x + 5) ] [ (5x - 3) - (6x + 5) ]
(16x - 3)² - (12x + 7)² =
[ (16x - 3) + (12x + 7) ] [ (16x - 3) - (12x + 7) ]
(7x - 3)² - (10x + 9)² =
[ (7x - 3) + (10x + 9) ] [ (7x - 3) - (10x + 9) ]
Espero haberte ayudado, saludos!