Exercice de factorisation, je dois juste faire l'exercice 58 aidez moi svp

Bonjour,

A = (x + 3)^2 - (x + 1)(x + 3)
A = (x + 3)(x + 3 - x - 1)
A = (x + 3) * 2
A = 2(x + 3)

B = (x + 4)(x - 1) - (x - 3)(x + 4)
B = (x + 4)(x - 1 - x + 3)
B = (x + 4) * 2
B = 2(x + 4)

C = 2x(x + 3) + x(x + 3)(x + 2)
C = x(x + 3)(2 + x + 2)
C = x(x + 3)(x + 4)