Bonsoir,
Développer:
A= 2(8x-2x²+3x) - 2x+x²+x²-4
A= -4x²+22x+2x²-2x-4
A= - 2x²+20x-4
B= (x-3) [ (4+x+2x-8)+3 ]
B= (x-3) [(- 4+3x) + 3 ]
B= (x-3)(3x-1)
B= 3x²-9x-x+3
B= 3x²-10x+3
