Bonjour,
Factoriser:
A= (x-2)²-6²
A= (x-2-6)(x-2+6)
A= (x-8)(x+4)
B= 1²-(2x+3)²
B= (1-2x-3)(1+2x+3)
B= (-2x-2)(2x+4)
B= -4(x+1)(x+2) changement de signes et fc: -4
C= (3x-2)²-(x+3)²
C= (3x-2-x-3)(3x-2+x+3)
C= (2x-5)(4x+1)
D= (x+5)²-(2x-4)²
D= (x+5-2x+4)(x+5+2x-4) attention aux signes
D= (-x+9)(3x+1)
D= - (x-9)(3x+1)
