Bonsoir
A = (x + 8)(x + 10)
= x² + 10 x + 8 x + 80
= x² + 18 x + 80
B = (2x + 7)(6x + 4)
= 12 x² + 8 x + 42 x + 28
= 12 x² + 50 x + 28
C = (3x – 4) (7x – 5)
= 21 x² - 15 x - 28 x + 20
= 21 x² - 43 x + 20
D = (2x + 3)(x + 1) + (5x – 3)
= 2 x² + 2 x + 3 x + 3 + 5 x - 3
= 2 x² + 10 x
E = (y – 6) (4y - 11) – (1 – 35y)
= 4 y² - 11 y - 24 y + 66 - 1 + 35 y
= 4 y² + 65
