pourriez vous m'aider !! merci

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

B = (11x-3)(11x+3)

C = (-x+12)(1+x-12)
   = (-x+12)(x-11)

G = (-2x+1-6)(-2x+1+6)
   = (-2x-5)(-2x+7)