Réponse :
1 ) A= (2x + 1) (3x - 2) + (2x - 3) (3x - 2)
A = (3x - 2) (2x + 1 + 2x - 3)
A = (3x - 2) (4x - 2)
A = (3x - 2) (x - 1)*2
B = (x + 5)^2 - 25
B = (x + 5) ^2 - 5^2
B = (x + 5 - 5) (x + 5 + 5)
B = x(x + 10)
2 ) A = (3x - 2) ( 4x - 2)
A = 12x^2 - 6x - 8x + 4
A = 12x^2 - 14x + 4
B = x(x + 10)
B = x^2 + 10x
