Bonjour aider moi a l'exercice 29, 30 et 31 :) Il faut factoriser

29
A = x(x+5)+x(3x-2)
A x(x+5+3x-2)
A = x(4x+3)

B = (x+5)(2x+1)+6(2x+1)
B = (2x+1)(x+5+6)
B = (2x+1)(x+11)

C = -4x(2x+3)+(2x+3)(9x-2)
C = (2x+3)(-4+9x-2)
C = (2x+3)(9x-6)

D = -8x(5x-1)-8x(12-x)
D = -8x(5x-1+12-x)
D = -8x(4x+11)

30

A = -7x(x+2)+(-7+x)(x+2)
A = (x+2)(-7x-7+x)
A = (x+2)(-6x-7)

B = -9x(4x-5)-(4x-5)(1-2x)
B = (4x-5)(-9x-1+2x)
B = (4x-5)(-8x-1)

C = 5(2x+3)-(3x-8)(2x+3)
C = (2x+3)(5-3x+8)
C = (2x+3)(-3x+13)

D = (1-2x)(9x-1)-(9x-1)(7+3x)
D = (9x-1) (1-2x-7-3x)
D =  (9x-1)(-5x-8)

31

A = (x+4)(x-6)+(-1+x)(x-6)
A = (x-6)(x+4-1+x)
A = (x-6)(2x+3)

B = (7x-4)(x+4)+(7x-4)(7x-1)
B = (7x-4)(x+4+7x-1)
B = (7x-4)(8x+3)

C = (x+1)(5x-6)-(5x-6)(-1+4x)
C = (5x-6)(x+1+1-4x)
C = (5x-6)(-3x+2)

D = (3x+8)(x+4)-(x-1)(3x+8)
D = (3x+8)(x+4-x+1)
D = (3x+8)(5)