Bonsoir
M = (5-3)(+4)-4(+4)
Développement
M = (5x² +20x -3x +12) - (4x² +16x)
M = 5x² +17x +12 -4x² -16x
M = x² +x +12
Factorisation
M = (x+4)(5x-3)-4x
M = (x+4)(5x-3-4x)
M = (x+4)(x -3)
N = 4(-1)-(-1)²
N = 4x -4 - (x² -2x +1)
N = 4x -4 - x² +2x -1
N = -x² +6x -5
Factorisation
N = 4 (x-1)