Bonjour
Développer :
(4x - 3) (4x - 5) - (9x + 10) (10x - 9)
= 16x² - 20x - 12x + 15 - (90x² - 81x + 100x - 90)
= 16x² - 20x - 12x + 15 - 90x² + 81x - 100x + 90
= 16x² - 90x² - 20x - 12x - 100x + 81x + 15 + 90
= - 74x² - 51x + 105
