Bonjour
(- 7x - 1) (-6x - 9) + (8x - 9) (5x - 2)
= 42x² + 63x + 6x + 9 + 40x² - 16x - 45x + 18
= 42x² + 40x² + 6x - 16x - 45x + 63x + 9 + 18
= 82x² + 8x + 27