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(3X-4) (4X+3) = 12x² + 9x - 16x -12 = 12x² - 7x -12
(2X-5) (3X-3)= 6 x² - 6x - 15x + 15 = 6x² - 21x + 15
Restamos
12x² - 7x -12
- 6x² + 21x - 15
----------------------
6x² + 14x - 27