Pouvez vous m'aider pour ces exercices s'il vous plaît?

Bonjour,

Photo trouble !!

1)

A = (3x - 1) (- 4x + 5)

A = - 12x² + 15x + 4x - 5

A = - 12x² + 19x - 5

B = (6x - 2) - (4x + 7)

B = 6x - 2 - 4x - 7

B = 6x - 4x - 2 - 7

B = - 10x - 9

C = 3x (5x - 8)

C = 15x² - 24x

D = (9x - 2) (5x - 7) + 2x (4x - 1)

D = 45x² - 63x - 10x + 14 + 8x² - 2x

D = 45x² + 8x² - 63x - 10x - 2x + 14

D = 53x² - 75x + 14

2)

- 5x - 7 = 3x + 1

- 5x - 3x = 1 + 7

- 8x = 8

x = - 8/8

x = - 1

3 (- 4x + 6) = - 6x + 24

- 4x + 6 = - 6x + 24

- 4x + 6x = 24 - 6

2x = 18

x = 18/2

x = 9

3 (5x - 7) - 6x = 4 (3x + 1) - 1

15x - 21 - 6x = 12x + 4 - 1

15x - 12x = 4 - 1 + 21

3x = 24

x = 24/3

x = 8