pourriez vous m aider !! merci

a =(2x-1-x-3)(2x-1+x+3)

a =(x-4)(3x+2)

g =(-2x+1)² -6²

g =(-2x+1-6)(-2x+1+6)

g =(-2x-5)(-2x+7)

b =11²x²-3²

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

c =(-x+12)(1+x-12)

c =(-x+12)(x-11)