Bonjour, pouvez vous m'aidez svp ?​

Bonjour,
Factorise les expressions suivantes :
a. (x - 3) (2x + 1) + (x - 3) (5x - 7)
= (x - 3) (2x + 1 + 5x - 7)
= (x - 3) (2x + 5x + 1 - 7)
= (x - 3) (7x - 6)
b. (5x - 6) (11x + 6) + 8 (11x + 6)
= (11x + 6) (8 + 5x - 6)
= (11x + 6) (5x + 2)
c. (7x² - 5) (3x + 9) + (7x - 12) (3x + 9)
= (3x + 9) (7x² - 5 + 7x - 12)
= 3 (x + 3) (7x² + 7x - 5 - 12)
3 (x + 3) (7x² + 7x - 17)
d. (8x - 5) (14x + 5) + (14x + 5)²
= (14x + 5) (14x + 5 + 8x - 5)
= (14x + 5) (14x + 8x + 5 - 5)
= 22x (14x + 5)
Bonjour,
Factoriser les expressions:
(x-3)(2x+1+5x-7)
(x-3)(7x-6)
(11x+6)(5x-6+8)
(11x+6)(5x+2)
(3x+9)(7x²-5+7x-12)
(3x+9)(7x²-7x-17)
(14x+5)(8x-5+14x+5)
(14x+5)(22x)
22x (14x+5)