Bonjour besoin d'aide svp : factoriser : A = x^2 - 4 + (x-2) (2x + 1 ) C = (5x + 1) (-3x + 4)+x(10x + 2) merci d'avance niveau seconde

A = x ²-4 + (x-2)(2x+1)
A = (x-2)(x+2) + (x-2)(2x+1)
A = (x-2)[(x+2)+(2x+1)]
A = (x-2)(x+2+2x+1)
A = (x-2)(3x+3)

C = (5x+1)(-3x+4)+x(10x+2)
C = (5x+1)(-3x+4)+2x(5x+1)
C = (5x+1)[(-3x+4)+2x]
C = (5x+1)(-3x+4+2x)
C = (5x+1)(-x+4)

Bonjour,

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

C = (5x + 1)(-3x + 4) + x(10x + 2)
C = (5x + 1)(-3x + 4) + 2x(5x + 1)
C = (5x + 1)(-3x + 4 + 2x)
C = (5x + 1)(-x + 4)