Bonjour,
Développer:
G = -3(2x - 1)² + (4 - x)(2x + 5)
G= -3(2x-1)(2x-1)+ (4-x)(2x+5)
G= -3(4x²-2x-2x+1)+8x-2x²+20-5x
G= -3(4x²-4x+1)-2x²+3x+20
G= -12x²+12x-3-2x²+3x+20
G= -14x²+15x+17
H= 2(2x-3)(2x+3)-(x+7)²
H= 2(2x-3)(2x+3)-(x+7)(x+7)
H= 2(4x²-6x+6x-9)-(x²+7x+7x+49)
H= 2(4x²-9)- (x²+14x+49)
H= 8x²-18-x²-14x-49
H= 7x²-14x-67