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(3x - 4)(4x + 3) - (2x - 5)(3x - 3)
(3x.4x - 3x.3 + 4.4x - 4.3) - (2x.3x - 2x.3 + 5.3x - 5.3)
(12x² - 9x + 16x - 12) - (6x² - 6x + 15x - 15)
(12x² + 7x - 12) - (6x² + 9x - 15)
12x² + 7x - 12 - 6x² - 9x + 15
Agrupamos los términos semejantes.
12x² - 6x² + 7x - 9x - 12 + 15
6x² - 2x + 3
Respuesta.
6x² - 2x + 3