bonjour
A=(7x+2)(8x+1) = 56 x² + 7 x + 16 x + 2 = 56 x² + 23 x + 2
2. B=(-8x +9)(6x - 2) = - 48 x² + 16 x + 54 x - 18 = - 48 x² + 70 x - 18
3. C= (-6x-2)(-5x - 1) = 30 x² + 6 x + 10 x + 2 = 30 x² + 16 x + 2
4. D= (-5x-7)(x - 5) = - 5 x² + 25 x - 7 x + 35 = - 5 x² + 18 x + 35
