Quelqu’un peut m’aider je n’y arrive pas

Bonjour

a. (5x + 7) (x - 3) - (x - 3) (x + 2)

= (x - 3) [(5x + 7) - (x + 2)]

= (x - 3) (5x + 7 - x - 2)

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

b. (x - 3) (2x - 5) + 2x - 6

(x - 3) (2x - 5) + 2 (x - 3)

= (x - 3) (2x - 3)

c. (x - 3)² + x - 3

= (x - 3) (x - 2)

d. (x + 3) (x - 3) - 5 (x - 3)²

= 2 (x - 3) (2x - 9)