Bonjour,
Développer les expressions:
C = (3x + 1)(x - 2) - (2x - 3)²
C= 3x²+x-6x-2- (4x²-6x-6x+9)
C= 3x²-5x-2-4x²+12x-9
C= -x²+7x-11
D = (3 – 2x) (3 + 2x) – (-3x + 1)(5 - 1/3 x)
D= 9-4x²- (-15x+5+3x²/3-x/3)
D= 9-4x²-x²+15x-5+x/3
D= -4x²+9-x²+15x*3/3+x/3-5
D= -5x²+46x/3+4