Svp j’ai un dm factoriser en détaillant svp

bonjour,

1)

(x+3) ( 2x+1 - 10x-12)=

(x+3) (-8x -11)

2)

(x-4) ( 2x+9 +21x +9) =

(x-4) ( 23x =18)

3)

(9x+6 ) = 3(3x+2)

(3x+2) ( 12x  +3 +1-4x) =

(3x+2) ( 8x +4)

4)

(5x-10) = 5(x-2)

(x-2) ( 10x  +15 - 15x  -27) =

(x-2) ( -5x -12)

5)

9x² +6x +1 = (3x+1)²

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

(3x+1) ( -x +2)

6)

(9x+18 ) = 9(x+2)

(4x+20) = 4(x+5)

9(x+2)²  - 4(x+5)²