bonjour
1)A = (3x - 1)(2 - 5x) + x(3x + 4)
A=6x-15x²-2+5x+3x²+4x
A=-12x²+15x-2
B = (x + 5)(2x - 3) - 3(4x + 1)
B=2x²-3x+10x-15-12x-3
B=2x²-5x-18
2)
C = (x - 3)(4x - 1) + (x - 3)(4x + 1)
C=(x-3)(4x-1+4x+1)
C=(x-3)(8x+)
D = (7x + 5)(3x - 2) + (7x + 5)(2x - 3)
D=(7x+5)(3x-2+2x-3)
D=(7x+5)(5x-5)